CMOS batteries - interchangeability **PIC** - Thinkpads Forum
New Bios Cmos 3v Motherboard Battery For Ibm Thinkpad T40 T41 T42 T43 R51 R52 T60 T61 T400 - Pc Hardware Cables & Adapters - AliExpress
Amazon.com: Synergy Digital CMOS/BIOS Battery, Compatible with IBM ThinkPad T43 CMOS/BIOS, (Lithium, 3V, 200mAh) Ultra High Capacity, Replacement for IBM 02K6541 Battery : Electronics