Go to Amazon Sites : br br Battpit? Laptop Notebook Battery Replacement for IBM ThinkPad T400 (2000 mAh) br br Type 111 Volt Li-ion Laptop Battery Ultrabay Secondary Battery br Capacity 2000 mAh Condition New br 30-Day Money Back Guarantee 1 Year Warranty br This is a genuine Battpit product comes with 1 year warranty Beware of imitation Battpit bears no responsibility on the imitation product purchased br This Battery is not compatible with ThinkPad R60e Z61e X61LS using the ThinkPad UltraBase R61eR61i Types 7649 7650 and 7657