4-Cell Battery for IBM/Lenovo ThinkPad X61 Tablet PC 7764 Battery Type: Li-Ion - Capacity: 1900mAh / 29 WHr - Voltage: 14.4V 4-Cell Made with high quality grade "A" cells 12 Months Replacement Warranty 100% OEM compatible! Guaranteed to meet or exceed OEM specifications Package Includes : 1 pcs laptop battery