【Fully Compatible】: NASTIMA 14.4V Li-ion battery is compatible with Xiaomi Roborock S5 S50 S6 S7 S7 MAX; Q5 Q7 Q7 MAX; T4/T6/T60 and other models not listed. Note: Only the voltage, size, plug of the battery are consistent, it can be replaced. 【Technical Specifications】: Voltage: 14.4V; Capacity: 6700mAh; Type: Li-ion; Size: 141*44*42mm/5.55*1.73*1.65in; Weight: 407g/0.9lb. Charge the battery before initial use. For long term storage, batteries should be charged and discharged every three months. 【Built-in BMS】: NASTIMA S50 batteries are equipped with over-charge, over-discharge, over-current, over-temperature and short-circuit protection, and the patented battery balancing technology ensures the safety of the batteries during use. 【High Capacity and Long Life】: NASTIMA S51 battery has more capacity than the original battery and works longer, which can support the sweeper to work in standard gear for more than 146 minutes. The hibernation self-consumption of power is low and there is no memory effect. 【100% Satisfaction】: Every customer who buys our products enjoys 35 days free return and 1 year warranty. If you have any questions, pleasefeel free to contact us and we will help you solve the problem. NASTIMA 14.4V 6700mAh 96.48Wh Li-ion Battery Compatible with Xiaomi Roborock S50 S51 S52 S53 S55 S502 S5 Max S6; T6 61 65 Full Series, Mijia 1st and 2nd Generation Replacement Battery with BMS 【Technical Specifications】: Voltage: 14.4V; Capacity: 6700mAh; Type: Li-ion; Size: 141*44*42mm/5.55*1.73*1.65in; Weight: 407g/0.9lb. Charge the battery before initial use. For long term storage, batteries should be charged and discharged every three months.