This item fits following models: (1) LENOVO: Lenovo R500,Lenovo Thinkpad R500, Lenovo ThinkPad T500, Lenovo Thinkpad W500,Lenovo IdeaPad SL500.(2) Lenovo ThinkPad T61 Series(14.1" standard screens and 15.4" widescreen).(3) Lenovo ThinkPad T61p Series(14.1" standard screens and 15.4" widescreen).(4) Lenovo ThinkPad R61 Series(14.1"&15.0" standard screens and 15.4" widescreen).(5) Lenovo ThinkPad R61i Series(14.1"&15.0" standard screens and 15.4" widescreen).(6) Lenovo ThinkPad R61e Series(15.4" widescreen).(7) Lenovo ThinkPad R61 Series: ThinkPad R61 8914, ThinkPad R61 8918, ThinkPad R61 8932, ThinkPad R61 8942, ThinkPad R61 8943.(8) Lenovo ThinkPad R61e Series: ThinkPad R61e 7649, ThinkPad R61e 7650.(9) Lenovo ThinkPad R61i Series: ThinkPad R61i 7650, ThinkPad R61i 8918,ThinkPad R61i 8932, ThinkPad R61i 8943.(10) Lenovo ThinkPad T61 Series: ThinkPad T61 6457, ThinkPad T61 6460, ThinkPad T61 6466, ThinkPad T61 8889, ThinkPad T61 8891, ThinkPad T61 8895,ThinkPad T61 8897, ThinkPad T61 8898.(11) Lenovo ThinkPad T61p Series: ThinkPad T61p 6459, ThinkPad T61p 6460, ThinkPad T61p 8889, ThinkPad T61p 8891. Compatible part numbers: 40Y6799, ASM 92P1138, ASM 92P1140, ASM 92P1142, FRU 42T4504, FRU 42T4513, FRU 42T5233, FRU 92P1137, FRU 92P1139, FRU 92P1141.Remark: 1. In using this replacement battery, a warning message of "NOT ORIGINAL / GENUINE BATTERY" will appear whenever switching on your computer. Computer functioning and battery charging would not be affected. What you need to do is to shut down the notice by clicking the "Power Manager". Thanks for your attention.2. Not compatible with ThinkPad T61/R61 14"widescreen & ThinkPad SL300, ThinkPad SL400 and ThinkPad SL500.