IBM THINKPAD 600X Premium quality replacement IBM ThinkPad 600X Battery This 10.8 volt, lithium-ion (Li-ion) IBM ThinkPad 600X Battery is rated at 4400mAH capacity It is 100% compatible with the original equipment es the highest quality graded and sorted cells. Provides excellent discharge characteristics Utilizes state of the art printed circuit board (PCB) design to provide stable and safe performance