Haven’t done this yet but from what I’ve read, macmini should be able to take 4GB RAM after the EFI update:

Expandable to 4GB after Core 2 Duo upgrade and macmini2.1 efi hack

Download macmini1,1 -> macmini2,1 firmware update:

https://support.apple.com/kb/DL1616?loca... (Mac mini EFI will be updated to 0106.B03)

https://gist.github.com/dreamcat4/717273...

My battery connector had a shiny metal cover over it like a male USB plug. I had to take the 3 peace symbol screws oit and remove the battery before I could access thr plug properly. My battery plug also came off parallel to the board by walking the black plastic part off the metal part towards the battery. It required quite a bit of force to walk it off the connector. I broke a spudger trying. Something nonconductive but strong like a wittled down bamboo chopstick could work well.