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Amazon.com: TsuLin 42T4802 Laptop Battery Replacement for Lenovo ThinkPad L410 L412 L421 L512 W510 W520 Series Notebook 42T4969 42T4802 55++ 11.1V 94Wh 8400mAh : Electronics
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Lenovo ThinkPad laptops: Online backlash over the removal of external battery options - NotebookCheck.net News
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Lenovo - Open Source ThinkPad Battery 70++ (9 Cell) - For Notebook - Battery Rechargeable - 11.1 V DC - 8400 mAh - Lithium Ion (Li-Ion) - WB Mason
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