the battery is very nasty indeed. it needs to come out and i need to remove the corrosion on the holder.

it's a NEDA 1306A cell! 4.5V.

@tubetime weren't these used in compact Macs, too?

@compu85 yeah

@tubetime @compu85 No! Compact Macs used the much more horrible 3.6V lithium thionyl chloride batteries, which are horrendously destructive when they leak. I've got a Compact Mac where the battery really went off, and there's a huge rusted spot on the steel frame above the battery holder.