Amazon.com: Original Lenovo ThinkPad X60, X61, X60S, X61S Series Laptop battery 22++ (8 Cell, High Capacity 5200mAh/75W, 14.4V) 40Y7003 w/ one replacement Spacer & screws[NOT compatible with the X60 X61 Tablet PC
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LENOVO ThinkPad X61 Series Battery - MICROMOS SA
Laptop Battery 92P1173 92P1174 for IBM Lenovo ThinkPad X60 X60s X61 - Green Cell
Green Cell Battery for Lenovo ThinkPad X60 X60s X61 X61s / 14,4V 4400mAh - TCS