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NEW BIOS CMOS 3V motherboard battery for IBM THINKPAD T40 T41 T42 T43 R51 R52 T60 T61 T400 - AliExpress
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Disassembly IBM ThinkPad T40, T41, T42 - replacement, clean, take apart, keyboard, screen, battery - YouTube
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New COMS Battery For Lenovo Thinkpad T500 T410 T420 T430 T510 Motherboard Built-in BIOS Battery - AliExpress
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