Premium Power Products compatible laptop battery for IBM Thinkpad X X20. Also works with X21 X22 X24. Fits with compatible part numbers: 02K6651 02K6652 02K6653 02K6678 02K6679 02K6710 02K6712 02K6760 02K6761 or 02K6712. Does not Fit X23 Laptops.