NewerTech® : Batteries : 3.6V Lithium 1/2 AA PRAM Battery for Mac®
How To Remove / Replace an iMac G3 PRAM Battery [Tray-Loading iMacs] - YouTube
1998 Bondi blue iMac rev A had it's pram battery explode and doesn't boot. This is after I cleaned the chips and board with alcohol. Is this savable? : r/VintageApple
Apple iMac MacPro Mac mini PRAM Battery – local338