Replace the BIOS Battery on an IBM Thinkpad 600X Cheaply : 7 Steps - Instructables
IBM ThinkPad R30 keeps giving me errors about System Battery, and I think I've found the right part but I'm not sure. (Pics and Links inside) : r/24hoursupport
Cmos Battery For Hp Compaq Presario Cq60 G60 G70 Cq50 Cq70 G62 G50 V2000 - Laptop Backup Bios Rtc 3V Cr2032 Battery With 2 Wires/Cable - Newegg.com