Yep, most batteries nubs are too short. found some tin foil to fill the gap between the nubs and the contact and finally got the green light!

On 2022-08-08 15:25:38 +0000, Ross Boone said:
>
> Yep, most batteries nubs are too short. found some tin foil to fill the
> gap between the nubs and the contact and finally got the green light!

The problem is the supposed battery "standards" (AA, AAA, 9-volt, etc.)
are not even remotely actually standard - the various makers do
different things. Batteries not fitting properly is certainly not
unique to Apple's devices.

On 08/08/2022 16:25, Ross Boone wrote:
> Yep, most batteries nubs are too short. found some tin foil to fill the gap between the nubs and the contact and finally got the green light!

What prompted you to respond to such an old post, Ross?

Regardless, it's good to hear that you got your old Magic Mouse to
function. The newer ones, of course, are themselves 'chargeable'!

--
Kind regards,
David B.

After reading through this thread, and having experienced a failure of rechargeable batteries not working in my Magic Mouse I, I reflected that they did work in my TV remote, suggesting that they had a charge. Here's the solution that I discovered, and how. I just posted this on Facebook. I'd like to hear that it NOW helps.
To whom it may concern:
I have a (wireless) Magic Mouse I for my Mac computer. Fatiguing from changing its AA batteries and, coincidentally and inadvertently, running out of them, I ordered some rechargeable batteries online. They did not work in the mouse, but they did work in my TV remote. This told me that they had a charge and, after a few days of repeated attempts to get them to work in my mouse, I went looking', both online. There, I saw comments that some batteries didn't work in the mouse, and I wondered why, if they, indeed, had a charge.
In the vernacular of the space age, and in deference to U.S. Astronauts, I buckled down and 'worked the problem'. In scrutinizing the rechargeable one, I noticed it had a subtle difference from the normal battery. The bottom was a bit flatter, and the positive post was not as pronounced. Somewhere, I saw where someone had suggested using aluminum foil to assure connectivity. After the addition of small balled pieces at that diminutive end, WHALLAH!
If even one of you is helped by this, and don't go out and buy a ton of disposable batteries, I'd be pleased to know. I was all set to invest in the newest rechargeable mouse, plus the wall plug (which doesn't come with it. So I've saved $85...and I hear this mouse is only good for 3 years, with it's rechargeable battery not being replaceable... That phrase, 'WORK THE PROBLEM', from 'Apollo 13' stuck in my head!

For me is clear that the Nubs on the positive side are too short. Some batteries do not work.
In my case, only the right side of the mouse is not connecting (+ side), because of the short nub. I have two types of rechargeable AA Battery, one with long nub (old) that I use on the right side and a short one in the left.
I'm thinking of putting some solder to fix the issue.

Regards,