This is a Brand New Replacement Battery for IBMLithium Ion System Battery is a rechargeable battery that supports the ThinkPad A20, A21, A22, series Notebooks. Compatible ThinkPad Models: ThinkPad A20: A20 Series, A20M, A20P. ThinkPad A21: A21 Series, A21M, A21P. ThinkPad A22: A22 Series, A22M, A22P. Replaces IBM part #s 02K6612 ,02K6614, 02K6615, 02K6616, 02K6617, 02K6618, 02K6619, 02K6640...