This is a Brand New Original Battery for IBM Lithium Ion System Battery is a rechargeable battery that supports the ThinkPad A21e, A22e, series Notebooks. Compatible ThinkPad Models: ThinkPad A21e: A21e, type:2655. ThinkPad A22e: A22e, type:2655, 2663, 2664. ThinkPad i1800: i1800, type:2655 Replaces IBM part #s 02K6738, 02K6739, 02K6740, 02K6741, 02K6743, 02K6776, 02K6777 , 02K6778, 02K6779...