IBM ThinkPad 600X Battery:Replacement Battery For IBM ThinkPad 600X
Replace the BIOS Battery on an IBM Thinkpad 600X Cheaply : 7 Steps - Instructables
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