My ThinkPad T43 After almost 15 year of Ownership still in Mint Condition like brand new with good factory battery. I just repasted and reinstalled it, Optimized as well. : r/thinkpad
Disassembly IBM ThinkPad T43 - replacement, clean, take apart, keyboard, screen, battery - YouTube
LQM® 10.8V 7800mAh New 40Y6797 Laptop Battery for Lenovo IBM ThinkPad T60 R60 R500
IBM ThinkPad T43 Battery Replacement - iFixit Repair Guide
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New Battery for IBM ThinkPad T40P T41 T42 T43 R50e R51e 92P1062 92P1067 08K8193 | eBay