The 4920mAh intelligent battery is suitable for CrystalSky monitor and Cendence remote controller. This 2s 4920mAh 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.