10.80V,4400mAh,Li-ion,Replacement Laptop Battery for LENOVO R500, Thinkpad R500, ThinkPad T500, Thinkpad W500, IdeaPad SL500, LENOVO ThinkPad R61, ThinkPad R61e, ThinkPad R61i, ThinkPad T61, ThinkPad T61p Series,IBM ThinkPad R60, R60e, R61, R61e, R61i, T60, T60p, T61, T61p Series,Compatible Part Numbers: 40Y6799, ASM 92P1138, ASM 92P1140, ASM 92P1142, FRU 42T4504, FRU 42T4513, FRU 42T5233, FRU 92P1137, FRU 92P1139, FRU 92P1141 More at http://ping.fm/CEGDQ