About This Full Compatibility: POEOSAS battery is fully compatible with eufy S330, S230, E330, S231 Video Smart Lock 3-in-1 and eufyCam S4, T8520 T8520S T8520J11 T8531 E8531JY1 T8520T11. It's a direct replacement for the original battery, ensuring perfect fit and function High Capacity & Specifications: With a 10500mAh capacity and 3.6/3.7V voltage, this lithium-ion battery for eufy replacemnet battery(77.5×59×21mm, 170g) provides extended power for your smart lock, reducing how often you need to recharge Charging indicator status: Flashing green indicates charging in progress; steady green indicates fully charged. LED indicator E to F four-segment status: E indicates low battery; Findicates nearly full charge. Built-in Safety Protection: Made with Grade A+ cells, this battery includes multiple protections: Over-Charge, Over-Discharge, Short-Circuit, and Over-Temperature protection for complete peace of mind. Uninterrupted Power Backup: Keep an extra battery for instant swaps when your smart lock runs low. Ensure your home security remains active without any downtime for charging Overview Number of Batteries : 1 A batteries required. (included) Brand : POEOSAS Battery Cell Composition : Lithium Ion Battery Capacity : 10500 Milliamp Hours Recommended Uses For Product : For eufy S330 S230 S220 E330 Video Smart Lock 3-in-1 Doorbell battery