Cameron Sino 200mAh Battery for IBM ThinkPad T22,T23,T30,T40,T41,T42,T43,T510,T520,T530,T60,T61,W500,W520,X30,X300,X31,X32,X400|Smart Accessories| - AliExpress
The dirty little secret about the ThinkPad T430's CMOS battery : Global Nerdy
FOR IBM THINKPAD R50E R50P R51 R52 R60 X30 X31 X32 300 LAPTOP CMOS BIOS BATTERY 818216833516 | eBay
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