LIB-52 Extended Li-Ion Battery for IBM Thinkpad T40 and T41 Series by Amstron brings you approximately 50% more power than the standard battery, allowing you to stay mobile and work longer on a single charge. The LIB-52 is designed to work with IBM OEM Part #'s 08K8195, 92P1011, 92P1060, 92P1071, 92P1075, 92P1087, 92P1089, 92P1091, 92P1101, 08K8192, 08K8193 and 08K8214. • 10.8V 6600mAh • 100% compatible with original manufacture charger • Guaranteed to meet or exceed original specifications • Full 1 year warranty • Extended Battery Will Stick out 1/2 an inch from back of Laptop