Intelligent Battery. Features: Compatible with CrystalSky monitors and the Cendence remote controller, this 2s 4920 mAh battery has excellent discharge performance at low temperatures and charges quickly. One battery offers four to five hours of operating time for a 7.85'' CrystalSky monitor, five to six hours for a 5.5'' CrystalSky monitor, and four hours for a Cendence remote controller. Capacity: 4920 mAh. Voltage: 7.6 V. Battery Type: LiPo. Energy: 37.39 Wh.