Is it a good idea to keep a battery powered car charger like this in the
glovebox?

https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank

I remember this was discussed before and I think Sylvia said that the
battery of the charger would lose its power before you ever had to use it?

Is this true? Are they a waste of time?

On 27/10/2021 12:11 pm, Max wrote:
> Is it a good idea to keep a battery powered car charger like this in
> the glovebox?
>
> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>
>
> I remember this was discussed before and I think Sylvia said that the
> battery of the charger would lose its power before you ever had to use
> it?

so just keep it charged up

>
> Is this true?  Are they a waste of time?

--
"A mans got to know his limitations"
- clint Eastwood as Dirty Harry

On 27/10/2021 12:23 pm, Yosemite Sam wrote:
> On 27/10/2021 12:11 pm, Max wrote:
>> Is it a good idea to keep a battery powered car charger like this in
>> the glovebox?
>>
>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>
>>
>> I remember this was discussed before and I think Sylvia said that the
>> battery of the charger would lose its power before you ever had to use
>> it?
>
>
> so just keep it charged up
>

Yeah but it's just sitting in your glovebox waiting to be used, so you
will just forget about it.

>
>>
>> Is this true?  Are they a waste of time?
>
>

On 27/10/2021 12:11 pm, Max wrote:
> Is it a good idea to keep a battery powered car charger like this in the
> glovebox?
>
> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>
>
> I remember this was discussed before and I think Sylvia said that the
> battery of the charger would lose its power before you ever had to use it?
>
> Is this true?  Are they a waste of time?

Can anyone comment on this type of charger? Doesn't look it has a
battery at all.

https://www.ozcharge.com.au/products/rescue-mate-1000-amp-battery-less-jump-starter

On 27/10/2021 9:25 am, Max wrote:
> On 27/10/2021 12:23 pm, Yosemite Sam wrote:
>> On 27/10/2021 12:11 pm, Max wrote:
>>> Is it a good idea to keep a battery powered car charger like this in
>>> the glovebox?
>>>
>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>
>>>
>>> I remember this was discussed before and I think Sylvia said that the
>>> battery of the charger would lose its power before you ever had to
>>> use it?
>>
>>
>> so just keep it charged up
>>
>
> Yeah but it's just sitting in your glovebox waiting to be used, so you
> will just forget about it.
>
>

Lithium-ion batteries keep their charge for a long time. They also don't
tolerate heat very well and can become unstable - which can lead to a
catastrophic uncontrollable fire. Temperatures in a car can get very hot
in summer in some parts of Australia so I'm not sure keeping those
batteries with such a high energy density in the car is a good idea. I
wouldn't.

On 27-Oct-21 12:11 pm, Max wrote:
> Is it a good idea to keep a battery powered car charger like this in the
> glovebox?
>
> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>
>
> I remember this was discussed before and I think Sylvia said that the
> battery of the charger would lose its power before you ever had to use it?
>
> Is this true?  Are they a waste of time?

What I was probably referring to was the fact that Lithium Ion batteries
lose their capacity to hold charge even if they're not being used.
Clocky's observation about the temperature in cars certainly factors
into that, because this loss of capacity is accelerated by high
temperatures.

So even if the capacity is 6000mAh when you buy it, it will not be that
by the time you need to use it. Note that this is a separate issue from
remembering to top up its charge due to self-discharge.

As an aside, the spec for this on the Laser web site

https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery

gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
output, that's only 1800mAh. The 6000mAh no doubt refers to the capacity
of the Lithium Ion cell, at its nominal 3.7V output. This is highly
misleading, to the point of being misrepresentation.

Add in the fact that batteries don't go flat on a whim. If you're in the
habit of leaving lights on for extended periods, you'd be better
installing a system to warn you about that.

I've only been stranded twice in a couple of decades, and one of those
occasions was when the battery developed some fault where it was
completely incapable of holding any charge (having been fine a couple of
hours earlier). The Laser device under discussion would not have helped
there.

Sylvia.

On 27/10/2021 12:46 pm, Max wrote:
> On 27/10/2021 12:11 pm, Max wrote:
>> Is it a good idea to keep a battery powered car charger like this in
>> the glovebox?
>>
>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>
>>
>> I remember this was discussed before and I think Sylvia said that the
>> battery of the charger would lose its power before you ever had to
>> use it?
>>
>> Is this true?  Are they a waste of time?
>
> Can anyone comment on this type of charger?  Doesn't look it has a
> battery at all.
>
> https://www.ozcharge.com.au/products/rescue-mate-1000-amp-battery-less-jump-starter
>

@ $499 it would be cheaper to just 'holler for a Marshall' if the need
arises

--
"A mans got to know his limitations"
- clint Eastwood as Dirty Harry

On 27/10/2021 12:46 pm, Clocky wrote:
> On 27/10/2021 9:25 am, Max wrote:
>> On 27/10/2021 12:23 pm, Yosemite Sam wrote:
>>> On 27/10/2021 12:11 pm, Max wrote:
>>>> Is it a good idea to keep a battery powered car charger like this
>>>> in the glovebox?
>>>>
>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>
>>>>
>>>> I remember this was discussed before and I think Sylvia said that
>>>> the battery of the charger would lose its power before you ever had
>>>> to use it?
>>>
>>>
>>> so just keep it charged up
>>>
>>
>> Yeah but it's just sitting in your glovebox waiting to be used, so
>> you will just forget about it.
>>
>>
>

well put it in your calendar at regular intervals, or tie a piece of
string around yer finger

> Lithium-ion batteries keep their charge for a long time. They also
> don't tolerate heat very well and can become unstable - which can lead
> to a catastrophic uncontrollable fire. Temperatures in a car can get
> very hot in summer in some parts of Australia so I'm not sure keeping
> those batteries with such a high energy density in the car is a good
> idea. I wouldn't.

take note of this

--
"A mans got to know his limitations"
- clint Eastwood as Dirty Harry

On 27/10/2021 1:07 pm, Sylvia Else wrote:
> On 27-Oct-21 12:11 pm, Max wrote:
>> Is it a good idea to keep a battery powered car charger like this in
>> the glovebox?
>>
>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>
>>
>> I remember this was discussed before and I think Sylvia said that the
>> battery of the charger would lose its power before you ever had to use
>> it?
>>
>> Is this true?  Are they a waste of time?
>
> What I was probably referring to was the fact that Lithium Ion batteries
> lose their capacity to hold charge even if they're not being used.
> Clocky's observation about the temperature in cars certainly factors
> into that, because this loss of capacity is accelerated by high
> temperatures.
>
> So even if the capacity is 6000mAh when you buy it, it will not be that
> by the time you need to use it. Note that this is a separate issue from
> remembering to top up its charge due to self-discharge.
>
> As an aside, the spec for this on the Laser web site
>
> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>
>
> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
> output, that's only 1800mAh. The 6000mAh no doubt refers to the capacity
> of the Lithium Ion cell, at its nominal 3.7V output. This is highly
> misleading, to the point of being misrepresentation.
>

Are you suggesting that this unit might not be capable of starting my car?

> Add in the fact that batteries don't go flat on a whim. If you're in the
> habit of leaving lights on for extended periods, you'd be better
> installing a system to warn you about that.
>
> I've only been stranded twice in a couple of decades, and one of those
> occasions was when the battery developed some fault where it was
> completely incapable of holding any charge (having been fine a couple of
> hours earlier). The Laser device under discussion would not have helped
> there.
>

The reason I want it is because my car is in an underground carpark
where there is no power point nearby.

Otherwise, I would just buy a traditional charger that plugs into a
powerpoint.

On 27/10/2021 1:38 pm, Max wrote:
> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>> On 27-Oct-21 12:11 pm, Max wrote:
>>> Is it a good idea to keep a battery powered car charger like this in
>>> the glovebox?
>>>
>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>
>>>
>>> I remember this was discussed before and I think Sylvia said that
>>> the battery of the charger would lose its power before you ever had
>>> to use it?
>>>
>>> Is this true?  Are they a waste of time?
>>
>> What I was probably referring to was the fact that Lithium Ion
>> batteries lose their capacity to hold charge even if they're not
>> being used. Clocky's observation about the temperature in cars
>> certainly factors into that, because this loss of capacity is
>> accelerated by high temperatures.
>>
>> So even if the capacity is 6000mAh when you buy it, it will not be
>> that by the time you need to use it. Note that this is a separate
>> issue from remembering to top up its charge due to self-discharge.
>>
>> As an aside, the spec for this on the Laser web site
>>
>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>
>>
>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This is
>> highly misleading, to the point of being misrepresentation.
>>
>
> Are you suggesting that this unit might not be capable of starting my
> car?
>
>> Add in the fact that batteries don't go flat on a whim. If you're in
>> the habit of leaving lights on for extended periods, you'd be better
>> installing a system to warn you about that.
>>
>> I've only been stranded twice in a couple of decades, and one of
>> those occasions was when the battery developed some fault where it
>> was completely incapable of holding any charge (having been fine a
>> couple of hours earlier). The Laser device under discussion would not
>> have helped there.
>>
>
> The reason I want it is because my car is in an underground carpark
> where there is no power point nearby.
>
> Otherwise, I would just buy a traditional charger that plugs into a
> powerpoint.
>

so there are no power points anywhere else in your world then...

--
"A mans got to know his limitations"
- clint Eastwood as Dirty Harry

On 27-Oct-21 1:38 pm, Max wrote:
> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>> On 27-Oct-21 12:11 pm, Max wrote:
>>> Is it a good idea to keep a battery powered car charger like this in
>>> the glovebox?
>>>
>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>
>>>
>>> I remember this was discussed before and I think Sylvia said that the
>>> battery of the charger would lose its power before you ever had to
>>> use it?
>>>
>>> Is this true?  Are they a waste of time?
>>
>> What I was probably referring to was the fact that Lithium Ion
>> batteries lose their capacity to hold charge even if they're not being
>> used. Clocky's observation about the temperature in cars certainly
>> factors into that, because this loss of capacity is accelerated by
>> high temperatures.
>>
>> So even if the capacity is 6000mAh when you buy it, it will not be
>> that by the time you need to use it. Note that this is a separate
>> issue from remembering to top up its charge due to self-discharge.
>>
>> As an aside, the spec for this on the Laser web site
>>
>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>
>>
>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This is
>> highly misleading, to the point of being misrepresentation.
>>
>
> Are you suggesting that this unit might not be capable of starting my car?

There are many factors at play. Your battery could be at a level just a
bit below what is required to start the car, and adding some extra
charge could be all that's needed to tip the balance.

But I would take a lot of convincing that this device is a practical
solution to flat batteries.

>
>> Add in the fact that batteries don't go flat on a whim. If you're in
>> the habit of leaving lights on for extended periods, you'd be better
>> installing a system to warn you about that.
>>
>> I've only been stranded twice in a couple of decades, and one of those
>> occasions was when the battery developed some fault where it was
>> completely incapable of holding any charge (having been fine a couple
>> of hours earlier). The Laser device under discussion would not have
>> helped there.
>>
>
> The reason I want it is because my car is in an underground carpark
> where there is no power point nearby.
>
> Otherwise, I would just buy a traditional charger that plugs into a
> powerpoint.
>

How often do you see this happening? One of those wheeled luggage
carriers can be used to move the battery to somewhere it can be charged
(always disconnect the ground lead first).

If you're finding that the battery is frequently flat, you either need a
new battery, or you have some other electrical issue in the car, perhaps
an alternator fault, or something that's drawing significant current all
the time.

Sylvia.

On 27/10/2021 1:47 pm, Sylvia Else wrote:
> On 27-Oct-21 1:38 pm, Max wrote:
>> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>>> On 27-Oct-21 12:11 pm, Max wrote:
>>>> Is it a good idea to keep a battery powered car charger like this
>>>> in the glovebox?
>>>>
>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>
>>>>
>>>> I remember this was discussed before and I think Sylvia said that
>>>> the battery of the charger would lose its power before you ever had
>>>> to use it?
>>>>
>>>> Is this true?  Are they a waste of time?
>>>
>>> What I was probably referring to was the fact that Lithium Ion
>>> batteries lose their capacity to hold charge even if they're not
>>> being used. Clocky's observation about the temperature in cars
>>> certainly factors into that, because this loss of capacity is
>>> accelerated by high temperatures.
>>>
>>> So even if the capacity is 6000mAh when you buy it, it will not be
>>> that by the time you need to use it. Note that this is a separate
>>> issue from remembering to top up its charge due to self-discharge.
>>>
>>> As an aside, the spec for this on the Laser web site
>>>
>>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>>
>>>
>>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This
>>> is highly misleading, to the point of being misrepresentation.
>>>
>>
>> Are you suggesting that this unit might not be capable of starting my
>> car?
>
> There are many factors at play. Your battery could be at a level just
> a bit below what is required to start the car, and adding some extra
> charge could be all that's needed to tip the balance.
>
> But I would take a lot of convincing that this device is a practical
> solution to flat batteries.
>
>>
>>> Add in the fact that batteries don't go flat on a whim. If you're in
>>> the habit of leaving lights on for extended periods, you'd be better
>>> installing a system to warn you about that.
>>>
>>> I've only been stranded twice in a couple of decades, and one of
>>> those occasions was when the battery developed some fault where it
>>> was completely incapable of holding any charge (having been fine a
>>> couple of hours earlier). The Laser device under discussion would
>>> not have helped there.
>>>
>>
>> The reason I want it is because my car is in an underground carpark
>> where there is no power point nearby.
>>
>> Otherwise, I would just buy a traditional charger that plugs into a
>> powerpoint.
>>
>
> How often do you see this happening? One of those wheeled luggage
> carriers can be used to move the battery to somewhere it can be
> charged (always disconnect the ground lead first).
>
> If you're finding that the battery is frequently flat, you either need
> a new battery, or you have some other electrical issue in the car,
> perhaps an alternator fault, or something that's drawing significant
> current all the time.
>

just get one of these and keep it in the boot ..
https://tinyurl.com/2m6f3uwm

> Sylvia.

--
"A mans got to know his limitations"
- clint Eastwood as Dirty Harry

On 27/10/2021 1:47 pm, Sylvia Else wrote:
> On 27-Oct-21 1:38 pm, Max wrote:
>> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>>> On 27-Oct-21 12:11 pm, Max wrote:
>>>> Is it a good idea to keep a battery powered car charger like this in
>>>> the glovebox?
>>>>
>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>
>>>>
>>>> I remember this was discussed before and I think Sylvia said that
>>>> the battery of the charger would lose its power before you ever had
>>>> to use it?
>>>>
>>>> Is this true?  Are they a waste of time?
>>>
>>> What I was probably referring to was the fact that Lithium Ion
>>> batteries lose their capacity to hold charge even if they're not
>>> being used. Clocky's observation about the temperature in cars
>>> certainly factors into that, because this loss of capacity is
>>> accelerated by high temperatures.
>>>
>>> So even if the capacity is 6000mAh when you buy it, it will not be
>>> that by the time you need to use it. Note that this is a separate
>>> issue from remembering to top up its charge due to self-discharge.
>>>
>>> As an aside, the spec for this on the Laser web site
>>>
>>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>>
>>>
>>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This is
>>> highly misleading, to the point of being misrepresentation.
>>>
>>
>> Are you suggesting that this unit might not be capable of starting my
>> car?
>
> There are many factors at play. Your battery could be at a level just a
> bit below what is required to start the car, and adding some extra
> charge could be all that's needed to tip the balance.
>
> But I would take a lot of convincing that this device is a practical
> solution to flat batteries.
>

What ampage would be necessary to start an engine if the battery is flat?

This product from Bunnings says it has 400A peak current. Would this be
sufficient?

https://delivery.bunningscontenthub.bunnings.com.au/api/public/content/3a6c738d28dd460281244316f5725da5?v=18f26548

>>
>>> Add in the fact that batteries don't go flat on a whim. If you're in
>>> the habit of leaving lights on for extended periods, you'd be better
>>> installing a system to warn you about that.
>>>
>>> I've only been stranded twice in a couple of decades, and one of
>>> those occasions was when the battery developed some fault where it
>>> was completely incapable of holding any charge (having been fine a
>>> couple of hours earlier). The Laser device under discussion would not
>>> have helped there.
>>>
>>
>> The reason I want it is because my car is in an underground carpark
>> where there is no power point nearby.
>>
>> Otherwise, I would just buy a traditional charger that plugs into a
>> powerpoint.
>>
>
> How often do you see this happening? One of those wheeled luggage
> carriers can be used to move the battery to somewhere it can be charged
> (always disconnect the ground lead first).
>

It would just be if I leave the interior light or the head/parking
lights on.

At the back of my mind also is that I might not drive for a few weeks,
or go away for a few months, and the battery might be drained by the
immobiliser.

> If you're finding that the battery is frequently flat, you either need a
> new battery, or you have some other electrical issue in the car, perhaps
> an alternator fault, or something that's drawing significant current all
> the time.
>
> Sylvia.

On 27/10/2021 2:02 pm, Yosemite Sam wrote:
> On 27/10/2021 1:47 pm, Sylvia Else wrote:
>> On 27-Oct-21 1:38 pm, Max wrote:
>>> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>>>> On 27-Oct-21 12:11 pm, Max wrote:
>>>>> Is it a good idea to keep a battery powered car charger like this
>>>>> in the glovebox?
>>>>>
>>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>>
>>>>>
>>>>> I remember this was discussed before and I think Sylvia said that
>>>>> the battery of the charger would lose its power before you ever had
>>>>> to use it?
>>>>>
>>>>> Is this true?  Are they a waste of time?
>>>>
>>>> What I was probably referring to was the fact that Lithium Ion
>>>> batteries lose their capacity to hold charge even if they're not
>>>> being used. Clocky's observation about the temperature in cars
>>>> certainly factors into that, because this loss of capacity is
>>>> accelerated by high temperatures.
>>>>
>>>> So even if the capacity is 6000mAh when you buy it, it will not be
>>>> that by the time you need to use it. Note that this is a separate
>>>> issue from remembering to top up its charge due to self-discharge.
>>>>
>>>> As an aside, the spec for this on the Laser web site
>>>>
>>>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>>>
>>>>
>>>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>>>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>>>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This
>>>> is highly misleading, to the point of being misrepresentation.
>>>>
>>>
>>> Are you suggesting that this unit might not be capable of starting my
>>> car?
>>
>> There are many factors at play. Your battery could be at a level just
>> a bit below what is required to start the car, and adding some extra
>> charge could be all that's needed to tip the balance.
>>
>> But I would take a lot of convincing that this device is a practical
>> solution to flat batteries.
>>
>>>
>>>> Add in the fact that batteries don't go flat on a whim. If you're in
>>>> the habit of leaving lights on for extended periods, you'd be better
>>>> installing a system to warn you about that.
>>>>
>>>> I've only been stranded twice in a couple of decades, and one of
>>>> those occasions was when the battery developed some fault where it
>>>> was completely incapable of holding any charge (having been fine a
>>>> couple of hours earlier). The Laser device under discussion would
>>>> not have helped there.
>>>>
>>>
>>> The reason I want it is because my car is in an underground carpark
>>> where there is no power point nearby.
>>>
>>> Otherwise, I would just buy a traditional charger that plugs into a
>>> powerpoint.
>>>
>>
>> How often do you see this happening? One of those wheeled luggage
>> carriers can be used to move the battery to somewhere it can be
>> charged (always disconnect the ground lead first).
>>
>> If you're finding that the battery is frequently flat, you either need
>> a new battery, or you have some other electrical issue in the car,
>> perhaps an alternator fault, or something that's drawing significant
>> current all the time.
>>
>
> just get one of these and keep it in the boot ..
> https://tinyurl.com/2m6f3uwm
>

Does it need a power point?

On 27/10/21 1:47 pm, Sylvia Else wrote:
> On 27-Oct-21 1:38 pm, Max wrote:
>> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>>> On 27-Oct-21 12:11 pm, Max wrote:
>>>> Is it a good idea to keep a battery powered car charger like this in
>>>> the glovebox?
>>>>
>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>
>>>>
>>>> I remember this was discussed before and I think Sylvia said that
>>>> the battery of the charger would lose its power before you ever had
>>>> to use it?
>>>>
>>>> Is this true?  Are they a waste of time?
>>>
>>> What I was probably referring to was the fact that Lithium Ion
>>> batteries lose their capacity to hold charge even if they're not
>>> being used. Clocky's observation about the temperature in cars
>>> certainly factors into that, because this loss of capacity is
>>> accelerated by high temperatures.
>>>
>>> So even if the capacity is 6000mAh when you buy it, it will not be
>>> that by the time you need to use it. Note that this is a separate
>>> issue from remembering to top up its charge due to self-discharge.
>>>
>>> As an aside, the spec for this on the Laser web site
>>>
>>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>>
>>>
>>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This is
>>> highly misleading, to the point of being misrepresentation.
>>>
>>
>> Are you suggesting that this unit might not be capable of starting my
>> car?
>
> There are many factors at play. Your battery could be at a level just a
> bit below what is required to start the car, and adding some extra
> charge could be all that's needed to tip the balance.
>
> But I would take a lot of convincing that this device is a practical
> solution to flat batteries.

I have 2 of those power pack jump starters, bought the second one after
I accidentally left the first one connected to the battery for too long
after the engine started and the cells overheated and swelled, thought
it was ruined but after it cooled down it still works.
I've used them lots of time to start cars with flat batteries, unless
the car battery is completed dead then the jump starter pack will
normally get the engine started.
I agree that they aren't successful 100% of the time but they are still
very useful devices, still held a charge good enough to start a car
after being left in the car boot for 12mths untouched.
>
>>
>>> Add in the fact that batteries don't go flat on a whim. If you're in
>>> the habit of leaving lights on for extended periods, you'd be better
>>> installing a system to warn you about that.
>>>
>>> I've only been stranded twice in a couple of decades, and one of
>>> those occasions was when the battery developed some fault where it
>>> was completely incapable of holding any charge (having been fine a
>>> couple of hours earlier). The Laser device under discussion would not
>>> have helped there.
>>>
>>
>> The reason I want it is because my car is in an underground carpark
>> where there is no power point nearby.
>>
>> Otherwise, I would just buy a traditional charger that plugs into a
>> powerpoint.
>>
>
> How often do you see this happening? One of those wheeled luggage
> carriers can be used to move the battery to somewhere it can be charged
> (always disconnect the ground lead first).
>
> If you're finding that the battery is frequently flat, you either need a
> new battery, or you have some other electrical issue in the car, perhaps
> an alternator fault, or something that's drawing significant current all
> the time.

Could also be that the car isn't being used very often, if that's the
case I would buy a charger that can be permanently connected, mount the
charge under the bonnet with permanent connections to the battery, when
the car is parked just plug it into 240volts then just unplug when you
need the car.
I used the same system to keep my boat batteries charged.

--
Daryl

On 27/10/2021 12:46 pm, Max wrote:
> On 27/10/2021 12:11 pm, Max wrote:
>> Is it a good idea to keep a battery powered car charger like this in
>> the glovebox?
>>
>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>
>>
>> I remember this was discussed before and I think Sylvia said that the
>> battery of the charger would lose its power before you ever had to use
>> it?
>>
>> Is this true?  Are they a waste of time?
>
> Can anyone comment on this type of charger?  Doesn't look it has a
> battery at all.
>
> https://www.ozcharge.com.au/products/rescue-mate-1000-amp-battery-less-jump-starter
>

**It uses a honkin' big capacitor. Mine came from Aldi. About $60.00, as
I recall. Works well. Well, it worked well, the first and only time I've
used it. As long as the battery is not completely dead (and most
aren't), it scavenges enough power to start the engine.

On 27/10/21 4:14 pm, Trevor Wilson wrote:
> On 27/10/2021 12:46 pm, Max wrote:
>> On 27/10/2021 12:11 pm, Max wrote:
>>> Is it a good idea to keep a battery powered car charger like this in
>>> the glovebox?
>>>
>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>
>>>
>>> I remember this was discussed before and I think Sylvia said that the
>>> battery of the charger would lose its power before you ever had to
>>> use it?
>>>
>>> Is this true?  Are they a waste of time?
>>
>> Can anyone comment on this type of charger?  Doesn't look it has a
>> battery at all.
>>
>> https://www.ozcharge.com.au/products/rescue-mate-1000-amp-battery-less-jump-starter
>>
>
> **It uses a honkin' big capacitor. Mine came from Aldi. About $60.00, as
> I recall. Works well. Well, it worked well, the first and only time I've
> used it. As long as the battery is not completely dead (and most
> aren't), it scavenges enough power to start the engine.

For $60 its worth keeping in the car just in case, if it doesn't work
you are no worse off.
I prefer the battery pack because it has other uses besides jump
starting cars, you can use it to charge a phone or a laptop if you have
no access to power plus they usually have a built in torch.

--
Daryl

On 27/10/2021 4:22 pm, Daryl wrote:
> On 27/10/21 4:14 pm, Trevor Wilson wrote:
>> On 27/10/2021 12:46 pm, Max wrote:
>>> On 27/10/2021 12:11 pm, Max wrote:
>>>> Is it a good idea to keep a battery powered car charger like this in
>>>> the glovebox?
>>>>
>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>
>>>>
>>>> I remember this was discussed before and I think Sylvia said that
>>>> the battery of the charger would lose its power before you ever had
>>>> to use it?
>>>>
>>>> Is this true?  Are they a waste of time?
>>>
>>> Can anyone comment on this type of charger?  Doesn't look it has a
>>> battery at all.
>>>
>>> https://www.ozcharge.com.au/products/rescue-mate-1000-amp-battery-less-jump-starter
>>>
>>
>> **It uses a honkin' big capacitor. Mine came from Aldi. About $60.00,
>> as I recall. Works well. Well, it worked well, the first and only time
>> I've used it. As long as the battery is not completely dead (and most
>> aren't), it scavenges enough power to start the engine.
>
> For $60 its worth keeping in the car just in case, if it doesn't work
> you are no worse off.
> I prefer the battery pack because it has other uses besides jump
> starting cars, you can use it to charge a phone or a laptop if you have
> no access to power plus they usually have a built in torch.
>

**I'm a belt and braces kinda guy. I keep both. They're small and light
enough to fit into the spare tyre cavity.

On 27/10/2021 1:38 pm, Max wrote:
> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>> On 27-Oct-21 12:11 pm, Max wrote:
>>> Is it a good idea to keep a battery powered car charger like this in
>>> the glovebox?
>>>
>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>
>>>
>>> I remember this was discussed before and I think Sylvia said that the
>>> battery of the charger would lose its power before you ever had to
>>> use it?
>>>
>>> Is this true?  Are they a waste of time?
>>
>> What I was probably referring to was the fact that Lithium Ion
>> batteries lose their capacity to hold charge even if they're not being
>> used. Clocky's observation about the temperature in cars certainly
>> factors into that, because this loss of capacity is accelerated by
>> high temperatures.
>>
>> So even if the capacity is 6000mAh when you buy it, it will not be
>> that by the time you need to use it. Note that this is a separate
>> issue from remembering to top up its charge due to self-discharge.
>>
>> As an aside, the spec for this on the Laser web site
>>
>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>
>>
>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This is
>> highly misleading, to the point of being misrepresentation.
>>
>
> Are you suggesting that this unit might not be capable of starting my car?
>
>> Add in the fact that batteries don't go flat on a whim. If you're in
>> the habit of leaving lights on for extended periods, you'd be better
>> installing a system to warn you about that.
>>
>> I've only been stranded twice in a couple of decades, and one of those
>> occasions was when the battery developed some fault where it was
>> completely incapable of holding any charge (having been fine a couple
>> of hours earlier). The Laser device under discussion would not have
>> helped there.
>>
>
> The reason I want it is because my car is in an underground carpark
> where there is no power point nearby.
>
> Otherwise, I would just buy a traditional charger that plugs into a
> powerpoint.
>

**Li-Ion batteries can deliver a huge amount of energy for a short time.
Although the battery may be rated for 6 Amp/hr, it can likely deliver
enough juice to crank the engine a couple of times. Be aware that those
devices are usually rated for specific engine sizes. Petrol and Diesel
engines have different requirements.

On 27/10/2021 2:21 pm, Max wrote:
> On 27/10/2021 2:02 pm, Yosemite Sam wrote:
>> On 27/10/2021 1:47 pm, Sylvia Else wrote:
>>> On 27-Oct-21 1:38 pm, Max wrote:
>>>> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>>>>> On 27-Oct-21 12:11 pm, Max wrote:
>>>>>> Is it a good idea to keep a battery powered car charger like this
>>>>>> in the glovebox?
>>>>>>
>>>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>>>
>>>>>>
>>>>>> I remember this was discussed before and I think Sylvia said that
>>>>>> the battery of the charger would lose its power before you ever
>>>>>> had to use it?
>>>>>>
>>>>>> Is this true?  Are they a waste of time?
>>>>>
>>>>> What I was probably referring to was the fact that Lithium Ion
>>>>> batteries lose their capacity to hold charge even if they're not
>>>>> being used. Clocky's observation about the temperature in cars
>>>>> certainly factors into that, because this loss of capacity is
>>>>> accelerated by high temperatures.
>>>>>
>>>>> So even if the capacity is 6000mAh when you buy it, it will not be
>>>>> that by the time you need to use it. Note that this is a separate
>>>>> issue from remembering to top up its charge due to self-discharge.
>>>>>
>>>>> As an aside, the spec for this on the Laser web site
>>>>>
>>>>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>>>>
>>>>>
>>>>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>>>>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>>>>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This
>>>>> is highly misleading, to the point of being misrepresentation.
>>>>>
>>>>
>>>> Are you suggesting that this unit might not be capable of starting
>>>> my car?
>>>
>>> There are many factors at play. Your battery could be at a level
>>> just a bit below what is required to start the car, and adding some
>>> extra charge could be all that's needed to tip the balance.
>>>
>>> But I would take a lot of convincing that this device is a practical
>>> solution to flat batteries.
>>>
>>>>
>>>>> Add in the fact that batteries don't go flat on a whim. If you're
>>>>> in the habit of leaving lights on for extended periods, you'd be
>>>>> better installing a system to warn you about that.
>>>>>
>>>>> I've only been stranded twice in a couple of decades, and one of
>>>>> those occasions was when the battery developed some fault where it
>>>>> was completely incapable of holding any charge (having been fine a
>>>>> couple of hours earlier). The Laser device under discussion would
>>>>> not have helped there.
>>>>>
>>>>
>>>> The reason I want it is because my car is in an underground carpark
>>>> where there is no power point nearby.
>>>>
>>>> Otherwise, I would just buy a traditional charger that plugs into a
>>>> powerpoint.
>>>>
>>>
>>> How often do you see this happening? One of those wheeled luggage
>>> carriers can be used to move the battery to somewhere it can be
>>> charged (always disconnect the ground lead first).
>>>
>>> If you're finding that the battery is frequently flat, you either
>>> need a new battery, or you have some other electrical issue in the
>>> car, perhaps an alternator fault, or something that's drawing
>>> significant current all the time.
>>>
>>
>> just get one of these and keep it in the boot ..
>> https://tinyurl.com/2m6f3uwm
>>
>
> Does it need a power point?
>

not to use it, only to charge it about once a year, or when it needs it.
eg. https://tinyurl.com/5atcrnnp  Very handy item to have in the boot.
lead acid battery so no lithium battery issues

--
"A mans got to know his limitations"
- clint Eastwood as Dirty Harry

On 27/10/2021 12:41 pm, Daryl wrote:
> On 27/10/21 1:47 pm, Sylvia Else wrote:
>> On 27-Oct-21 1:38 pm, Max wrote:
>>> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>>>> On 27-Oct-21 12:11 pm, Max wrote:
>>>>> Is it a good idea to keep a battery powered car charger like this
>>>>> in the glovebox?
>>>>>
>>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>>
>>>>>
>>>>> I remember this was discussed before and I think Sylvia said that
>>>>> the battery of the charger would lose its power before you ever had
>>>>> to use it?
>>>>>
>>>>> Is this true?  Are they a waste of time?
>>>>
>>>> What I was probably referring to was the fact that Lithium Ion
>>>> batteries lose their capacity to hold charge even if they're not
>>>> being used. Clocky's observation about the temperature in cars
>>>> certainly factors into that, because this loss of capacity is
>>>> accelerated by high temperatures.
>>>>
>>>> So even if the capacity is 6000mAh when you buy it, it will not be
>>>> that by the time you need to use it. Note that this is a separate
>>>> issue from remembering to top up its charge due to self-discharge.
>>>>
>>>> As an aside, the spec for this on the Laser web site
>>>>
>>>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>>>
>>>>
>>>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>>>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>>>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This
>>>> is highly misleading, to the point of being misrepresentation.
>>>>
>>>
>>> Are you suggesting that this unit might not be capable of starting my
>>> car?
>>
>> There are many factors at play. Your battery could be at a level just
>> a bit below what is required to start the car, and adding some extra
>> charge could be all that's needed to tip the balance.
>>
>> But I would take a lot of convincing that this device is a practical
>> solution to flat batteries.
>
> I have 2 of those power pack jump starters, bought the second one after
> I accidentally left the first one connected to the battery for too long
> after the engine started and the cells overheated and swelled, thought
> it was ruined but after it cooled down it still works.

*Don't* use it and get rid of it!

On 27/10/2021 5:18 pm, Yosemite Sam wrote:
> On 27/10/2021 2:21 pm, Max wrote:
>> On 27/10/2021 2:02 pm, Yosemite Sam wrote:
>>> On 27/10/2021 1:47 pm, Sylvia Else wrote:
>>>> On 27-Oct-21 1:38 pm, Max wrote:
>>>>> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>>>>>> On 27-Oct-21 12:11 pm, Max wrote:
>>>>>>> Is it a good idea to keep a battery powered car charger like this
>>>>>>> in the glovebox?
>>>>>>>
>>>>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>>>>
>>>>>>>
>>>>>>> I remember this was discussed before and I think Sylvia said that
>>>>>>> the battery of the charger would lose its power before you ever
>>>>>>> had to use it?
>>>>>>>
>>>>>>> Is this true?  Are they a waste of time?
>>>>>>
>>>>>> What I was probably referring to was the fact that Lithium Ion
>>>>>> batteries lose their capacity to hold charge even if they're not
>>>>>> being used. Clocky's observation about the temperature in cars
>>>>>> certainly factors into that, because this loss of capacity is
>>>>>> accelerated by high temperatures.
>>>>>>
>>>>>> So even if the capacity is 6000mAh when you buy it, it will not be
>>>>>> that by the time you need to use it. Note that this is a separate
>>>>>> issue from remembering to top up its charge due to self-discharge.
>>>>>>
>>>>>> As an aside, the spec for this on the Laser web site
>>>>>>
>>>>>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>>>>>
>>>>>>
>>>>>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>>>>>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>>>>>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This
>>>>>> is highly misleading, to the point of being misrepresentation.
>>>>>>
>>>>>
>>>>> Are you suggesting that this unit might not be capable of starting
>>>>> my car?
>>>>
>>>> There are many factors at play. Your battery could be at a level
>>>> just a bit below what is required to start the car, and adding some
>>>> extra charge could be all that's needed to tip the balance.
>>>>
>>>> But I would take a lot of convincing that this device is a practical
>>>> solution to flat batteries.
>>>>
>>>>>
>>>>>> Add in the fact that batteries don't go flat on a whim. If you're
>>>>>> in the habit of leaving lights on for extended periods, you'd be
>>>>>> better installing a system to warn you about that.
>>>>>>
>>>>>> I've only been stranded twice in a couple of decades, and one of
>>>>>> those occasions was when the battery developed some fault where it
>>>>>> was completely incapable of holding any charge (having been fine a
>>>>>> couple of hours earlier). The Laser device under discussion would
>>>>>> not have helped there.
>>>>>>
>>>>>
>>>>> The reason I want it is because my car is in an underground carpark
>>>>> where there is no power point nearby.
>>>>>
>>>>> Otherwise, I would just buy a traditional charger that plugs into a
>>>>> powerpoint.
>>>>>
>>>>
>>>> How often do you see this happening? One of those wheeled luggage
>>>> carriers can be used to move the battery to somewhere it can be
>>>> charged (always disconnect the ground lead first).
>>>>
>>>> If you're finding that the battery is frequently flat, you either
>>>> need a new battery, or you have some other electrical issue in the
>>>> car, perhaps an alternator fault, or something that's drawing
>>>> significant current all the time.
>>>>
>>>
>>> just get one of these and keep it in the boot ..
>>> https://tinyurl.com/2m6f3uwm
>>>
>>
>> Does it need a power point?
>>
>
> not to use it, only to charge it about once a year, or when it needs it.
> eg. https://tinyurl.com/5atcrnnp  Very handy item to have in the boot.
> lead acid battery so no lithium battery issues
>
>

**Lead acid batteries are hopeless for such a task. They suffer
significant problems, including:

* Mass. Lead acid are MUCH heavier.
* Size. Lead acid are much larger.
* Longevity. The lead acid batteries used are cheap, gel-cell types.
They have an officially rated life of 2 years. Li-Ion batteries last
MUCH longer.
* Charge issues. Lead acid batteries cannot be allowed to fall below a
specific level.

I've owned several lead acid battery types. All were hopeless.

On 27/10/2021 8:04 pm, Trevor Wilson wrote:
> On 27/10/2021 5:18 pm, Yosemite Sam wrote:
>> On 27/10/2021 2:21 pm, Max wrote:
>>> On 27/10/2021 2:02 pm, Yosemite Sam wrote:
>>>> On 27/10/2021 1:47 pm, Sylvia Else wrote:
>>>>> On 27-Oct-21 1:38 pm, Max wrote:
>>>>>> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>>>>>>> On 27-Oct-21 12:11 pm, Max wrote:
>>>>>>>> Is it a good idea to keep a battery powered car charger like
>>>>>>>> this in the glovebox?
>>>>>>>>
>>>>>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>>>>>
>>>>>>>>
>>>>>>>> I remember this was discussed before and I think Sylvia said
>>>>>>>> that the battery of the charger would lose its power before you
>>>>>>>> ever had to use it?
>>>>>>>>
>>>>>>>> Is this true?  Are they a waste of time?
>>>>>>>
>>>>>>> What I was probably referring to was the fact that Lithium Ion
>>>>>>> batteries lose their capacity to hold charge even if they're not
>>>>>>> being used. Clocky's observation about the temperature in cars
>>>>>>> certainly factors into that, because this loss of capacity is
>>>>>>> accelerated by high temperatures.
>>>>>>>
>>>>>>> So even if the capacity is 6000mAh when you buy it, it will not
>>>>>>> be that by the time you need to use it. Note that this is a
>>>>>>> separate issue from remembering to top up its charge due to
>>>>>>> self-discharge.
>>>>>>>
>>>>>>> As an aside, the spec for this on the Laser web site
>>>>>>>
>>>>>>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>>>>>>
>>>>>>>
>>>>>>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>>>>>>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>>>>>>> capacity of the Lithium Ion cell, at its nominal 3.7V output.
>>>>>>> This is highly misleading, to the point of being misrepresentation.
>>>>>>>
>>>>>>
>>>>>> Are you suggesting that this unit might not be capable of starting
>>>>>> my car?
>>>>>
>>>>> There are many factors at play. Your battery could be at a level
>>>>> just a bit below what is required to start the car, and adding some
>>>>> extra charge could be all that's needed to tip the balance.
>>>>>
>>>>> But I would take a lot of convincing that this device is a
>>>>> practical solution to flat batteries.
>>>>>
>>>>>>
>>>>>>> Add in the fact that batteries don't go flat on a whim. If you're
>>>>>>> in the habit of leaving lights on for extended periods, you'd be
>>>>>>> better installing a system to warn you about that.
>>>>>>>
>>>>>>> I've only been stranded twice in a couple of decades, and one of
>>>>>>> those occasions was when the battery developed some fault where
>>>>>>> it was completely incapable of holding any charge (having been
>>>>>>> fine a couple of hours earlier). The Laser device under
>>>>>>> discussion would not have helped there.
>>>>>>>
>>>>>>
>>>>>> The reason I want it is because my car is in an underground
>>>>>> carpark where there is no power point nearby.
>>>>>>
>>>>>> Otherwise, I would just buy a traditional charger that plugs into
>>>>>> a powerpoint.
>>>>>>
>>>>>
>>>>> How often do you see this happening? One of those wheeled luggage
>>>>> carriers can be used to move the battery to somewhere it can be
>>>>> charged (always disconnect the ground lead first).
>>>>>
>>>>> If you're finding that the battery is frequently flat, you either
>>>>> need a new battery, or you have some other electrical issue in the
>>>>> car, perhaps an alternator fault, or something that's drawing
>>>>> significant current all the time.
>>>>>
>>>>
>>>> just get one of these and keep it in the boot ..
>>>> https://tinyurl.com/2m6f3uwm
>>>>
>>>
>>> Does it need a power point?
>>>
>>
>> not to use it, only to charge it about once a year, or when it needs
>> it. eg. https://tinyurl.com/5atcrnnp  Very handy item to have in the
>> boot. lead acid battery so no lithium battery issues
>>
>>
>
> **Lead acid batteries are hopeless for such a task. They suffer
> significant problems, including:
>
> * Mass. Lead acid are MUCH heavier.
> * Size. Lead acid are much larger.
> * Longevity. The lead acid batteries used are cheap, gel-cell types.
> They have an officially rated life of 2 years. Li-Ion batteries last
> MUCH longer.
> * Charge issues. Lead acid batteries cannot be allowed to fall below a
> specific level.
>
> I've owned several lead acid battery types. All were hopeless.

It's all sounding too difficult. I think I will forget about buying
anything and just make sure I don't leave any lights on in the car.

On 27/10/2021 3:27 pm, Trevor Wilson wrote:
> On 27/10/2021 1:38 pm, Max wrote:
>> On 27/10/2021 1:07 pm, Sylvia Else wrote:
>>> On 27-Oct-21 12:11 pm, Max wrote:
>>>> Is it a good idea to keep a battery powered car charger like this in
>>>> the glovebox?
>>>>
>>>> https://www.binglee.com.au/products/laser-pb-cj6000-6000mah-emergency-power-bank
>>>>
>>>>
>>>> I remember this was discussed before and I think Sylvia said that
>>>> the battery of the charger would lose its power before you ever had
>>>> to use it?
>>>>
>>>> Is this true?  Are they a waste of time?
>>>
>>> What I was probably referring to was the fact that Lithium Ion
>>> batteries lose their capacity to hold charge even if they're not
>>> being used. Clocky's observation about the temperature in cars
>>> certainly factors into that, because this loss of capacity is
>>> accelerated by high temperatures.
>>>
>>> So even if the capacity is 6000mAh when you buy it, it will not be
>>> that by the time you need to use it. Note that this is a separate
>>> issue from remembering to top up its charge due to self-discharge.
>>>
>>> As an aside, the spec for this on the Laser web site
>>>
>>> https://www.laserco.com.au/PB-CJ6000-6000mah-emergency-power-with-clippers-for-car-battery
>>>
>>>
>>> gives something called "Watt Rating" of 21.6Wh. For a nominal 12V
>>> output, that's only 1800mAh. The 6000mAh no doubt refers to the
>>> capacity of the Lithium Ion cell, at its nominal 3.7V output. This is
>>> highly misleading, to the point of being misrepresentation.
>>>
>>
>> Are you suggesting that this unit might not be capable of starting my
>> car?
>>
>>> Add in the fact that batteries don't go flat on a whim. If you're in
>>> the habit of leaving lights on for extended periods, you'd be better
>>> installing a system to warn you about that.
>>>
>>> I've only been stranded twice in a couple of decades, and one of
>>> those occasions was when the battery developed some fault where it
>>> was completely incapable of holding any charge (having been fine a
>>> couple of hours earlier). The Laser device under discussion would not
>>> have helped there.
>>>
>>
>> The reason I want it is because my car is in an underground carpark
>> where there is no power point nearby.
>>
>> Otherwise, I would just buy a traditional charger that plugs into a
>> powerpoint.
>>
>
> **Li-Ion batteries can deliver a huge amount of energy for a short time.
> Although the battery may be rated for 6 Amp/hr, it can likely deliver
> enough juice to crank the engine a couple of times. Be aware that those
> devices are usually rated for specific engine sizes. Petrol and Diesel
> engines have different requirements.

Depends on the batterys rated discharge rate usually referred to as C.
If for instance the battery has a capacity of 6000mAH and C = 1, the
battery can give 6 amps for one hour, if C = 10 then it can give 60 amps
for 6 minutes. Many LiPo cells have a C of up to 70 so a 6000mAH cell
could give 320 amps for about 50 seconds (and it would get quite hot). A
starter pack would likely have 4 cells in series @3.7volts per cell
giving a bit over 14volts (probably a bit less under that sort of load).

On 27/10/2021 1:47 pm, Sylvia Else wrote:
> On 27-Oct-21 1:38 pm, Max wrote:

>> Are you suggesting that this unit might not be capable of starting my
>> car?
>
> There are many factors at play. Your battery could be at a level just a
> bit below what is required to start the car, and adding some extra
> charge could be all that's needed to tip the balance.
>
> But I would take a lot of convincing that this device is a practical
> solution to flat batteries.

Not this one perhaps, but there are some very, very good ones out there.
I have one of these:

> https://no.co/gb150

It will start anything, whether it has a battery in it or not.

--
--
--
Regards,
Noddy.