Lithium-Ion (Li-Ion). 6621 mAh 51 Wh. 7.7 V. Brand compatibility: Lenovo. Black. Number of batteries included: 1 pc(s). Features. Brand compatibility. Lenovo. Product colour. Black. Battery voltage. 7.7 V. Number of battery cells. 4. Battery capacity. 6621 mAh. Battery technology. Lithium-Ion (Li-Ion). Packaging data. Number of batteries included. 1 pc(s)