ThinkPad Battery FRU part number
R60, R61, T60, T61 42T4546, 42T4566, 92P1141
X60, X61 42T4550, 42T4567, 42T4568, 92P1169, 92P1173, 93P5028, 93P5030

ACTION
If you are experiencing any of these models with the problems above, please
click on the link below to see if you qualify for a replacement:

http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=BATT-082009