DC-battery is a Consumer Electronics company profession on Replacement Laptop AC Adapter for IBM Thinkpad 172, 240, 310, 340, 345, 365, 370, 380, 385, 390, 535, 550, 560, 570, 600, 701, 765, 770, 1400, 1500 Series / Thinkpad i172, i1200, i1300, i1400, i1500, i1700 Series / ThinkPad A20, A21, A22, i, R, T, X Serie selling high capacity batteries with build in security circuit also batteries are tested before ship from our warehouse.Base on 1 Year warranty for all our products. In here, 100% compatible with IBM orginal Li-ion battery.