Lenovo ThinkPad X300 Series 6 Cell Li-Ion Battery. Battery technology: Lithium-Ion (Li-Ion), Battery capacity: 2120 mAh, Battery voltage: 10.8, 11.2 V. Width: 10.07 in, Depth: 2.84 in, Height: 0.51 in. Dimensions (WxDxH): 255 x 72 x 13 mm, Battery type: 6 Cell Lithium-Ion