Replacement Battery for Xiaomi Roborock S55 S60 S65 S50 S51 S5 MAX Robot Vacuum Cleaner S6 Parts 14.4V 12800mAh

However, a serious capacity problem emerges with extended use. Approximately 10% of buyers report that actual runtime is significantly lower than the seller claims — the battery drains in 15 to 70 minutes instead of the expected time corresponding to 12800 mAh capacity. Some compare performance to the original battery with half the capacity and found this battery lasts shorter. Others reported a sudden voltage drop around 40–45% charge, forcing the vacuum to return to the charging dock.

Critical reviews point to suspected fake capacity — actual runtime indicates capacity below 3000 mAh instead of the claimed 12800 mAh. Some buyers also reported batteries that do not charge at all or drain from 100% to 0% without a functional intermediate state. The proportion of negative ratings (10.3%) is unusually high for a replacement battery and suggests a systematic quality or capacity problem in part of the shipments.