IBM ThinkPad T41 CMOS Battery Replacement - iFixit Repair Guide
FOR IBM THINKPAD R50E R50P R51 R52 R60 X30 X31 X32 300 LAPTOP CMOS BIOS BATTERY 818216833516 | eBay
NEW CMOS Battery for IBM Lenovo T430 IBM Lenovo X30 IBM Lenovo X31 IBM Lenovo X220 IBM Lenovo T410 IBM Lenovo T420 IBM Lenovo W510 IBM Lenovo W700 IBM Lenovo 02K7078 ThinkPad
IBM ThinkCenter Laptop: How to Replace BIOS Battery - YouTube
FOR IBM THINKPAD R50E R50P R51 R52 R60 X30 X31 X32 300 LAPTOP CMOS BIOS BATTERY 818216833516 | eBay
Retro Computing Grotto: How To Replace The IBM ThinkPad 380D (Type 2635) CMOS Battery