Lenovo P770 & P770i (BL205) Li-Polymer Replacement Battery The BL205 lithium polymer battery is engineered to provide extended and reliable power for Lenovo P770 series smartphones. With a high 3500mAh capacity and 3.8V nominal voltage, it ensures long-lasting daily performance, efficient energy management, and safe charging up to 4.35V for dependable mobile use. Specifications Model: BL205 Battery Type: Lithium Polymer Nominal Voltage: 3.8V Charging Limit Voltage: 4.35V Capacity: 3500mAh Energy: 13.3Wh Compatibility: Lenovo P770, P770i