Some time ago I posted about my 486 SBC I am going to use in my Amiga 2000 to save space.
Did manage to get it running, and fix the fuse issue, that made the keyboard/mouse not work.

It now works apart from getting battery errors every time I boot, and also have to make changes in bios every time power is off.
This is really inconvenient.

So got myself some 12B887, but as I didn't have the right tools, I sort of bodged that one.
See more on why below.

Got a few 12C887, from China, that should work, but when installed on the board (it's now has a socket) battery still not found.

So had a new go at it. and discovered that pins on the 12887 are not the same as the 12B/C887

As I had ruined one of them anyway, I decided to keep going to see what it looked like.

As can be seen from the pictures the minus in on top, and plus on the bottom.
At some point the battery itself came of, and underneath it says Odin.

Guess they make the electronics for it.

So any ideas on how to make this working again.

Do anyone know what pins is '+' and what is '-'.
If so, it should be possible to disconnect the 'tap' , and connect a wire to '+'.
Tried to measure, but don't really get anything on my meter.