Lithium Polymer (LiPo). 3500 mAh 56 Wh. 15.2 V. Black. Number of batteries included: 1 pc(s). DELL Main Battery Pack 15.2V 3500mAh. Features. Product colour. Black. Battery voltage. 15.2 V. Number of battery cells. 4. Battery capacity. 3500 mAh. Battery technology. Lithium Polymer (LiPo). Packaging data. Number of batteries included. 1 pc(s). leaflet. Origin Promo. Origin Eco