Upgraded to 10500mAh High Capacity The superb battery capacity of 10500mAh battery ensures that your security system runs uninterruptedly! Upgraded thickened battery cell, it can work in the temperature range of 22 F to 158 F (-30 to 70 ). Wide compatibility Rechargeable S330 battery are Fully compatible with eufy Security S330/E330 3-in-1 Video Smart Lock, S230/S231/S220 Smart Lock, Smart Drop (T8790), Security Smart Lock Touch (T8520T11), T8520 T8520S T8520J11 T8531 E8531JY1 Easy to use Battery installation and removal requires no tools, no need to remove the doorbell from the door, the battery comes with a 17.3-inch type-c charging cable. The battery can be fully charged in as little as 6 hours at 5V/2A. BURFLO POWER Protection BURFLO High Quality Battery built with multiple circuit protection (over-charging, over-power, short-circuit, high-temperature, over voltage and battery PTC protection)