✅ Product Specification: High capacity 6500mAh 14.4V Li-ion battery extends runtime up to 150 minutes. (This is Energup.) ✅ Widely Compatibility: Compatible with Xiaomi Mi Robot and Mijia Roborock S50 S51 robot vacuums. ✅ Battery Anvantage: No memory effect: the battery can be recycled at least 540 times and the battery capacity cannot be reduced. Fast charging: only 1-hour charge, the battery is full. ✅ Safe&Reliable: Made from high-quality battery cells, with the CE FCC and RoHS certified. Protection against short circuit, overcharge, over-discharge, over-current, and overheating. 💞【Premium Service】All energup with 45 days money back, 12 months warranty. If you need any help about this xiaomi battery, please have a try again, or feel free to contact us via your Order ID. We'll take responsibility to help your address this issue. 💞【Sweet Tips】1. After using the battery extensively, please let it cool down and then charge it. 2. Store it in a clean, dry, cool place, and away from heat and metal objects. 3. Charge the product before it is completely exhausted. If it is not used for a long time, charge it at least once every 2 months. Compatible with the Xiaomi Mi Robot Xiaomi Mijia Roborock S50 S51 Xiaomi robot vacuum cleaner of the 1st and 2nd Generation