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IBM Thinkpad T61 Battery Replacement - iFixit Repair Guide
Amazon.com: Laptop Battery for IBM/Lenovo ThinkPad R61 R61i T61 T61p T61u T400 R400 Series (ONLY for 14.1-inch Widescreen), fits 42T4644 42T4645 42T4677 42T4678 42T4743 42T4745 42T4771 42T5262 42T5264 : Electronics
Green Cell 4400mAh battery compatible with Lenovo IBM ThinkPad R61 ...
IBM Thinkpad T61 Battery Replacement - iFixit Repair Guide
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Amazon.com: High Performance Battery fit IBM ThinkPad Widescreen R61 R61i T61 T61p T400 R400 Series Laptop 14.1 Inch -Futurebatt : Electronics