Stay unplugged even longer with Think Pad Battery 39+. This six-cell slice battery uses Lithium-Ion (Li-Ion) technology & easily attaches to Lenovo X1. Use along with system battery to provide an all-day computing experience. Features Cells: 6-cell Technology: Lithium Ion Voltage: 11.1 V Capacity: 36 Wh Hot-swappable battery
Dimensions Width 31.4 cm Depth 13 cm Height 2.3 cm Weight 390 g