6800mAh Li-ion Replacement Battery for Xiaomi Mijia Roborock S4 S5 S6 S7 S50 S51 S52 S55 T4 T6 T7 T60 T61 T65 E4 E5 E20 E25 E35 C10 CT10 S5 Max Q7 S7 Max Robot Vacuum Cleaner

Pros:-Easy installation with just a few screws to remove on the underside of the robot.-Came with 88% charge.-Improved the battery life of my robovac. It can now run for about 145 minutes before it needs to return to the dock to charge.-Includes a screwdriver for removing the necessary screws-Quality feels just as good as the original battery.-Fits in my Roborock S7 without issue.Cons:-Doesn't come with any instructions, but a quick YouTube search was all I needed to know what to do.-Slightly lighter than the original battery (423g for this battery vs 430g for the original).Time will tell if this battery maintains its performance in the long run, but for now I am happy with this battery, and I would recommend it.

Quality made battery pack, no issues charging and it was half charged on arrival. It has good voltage/power and the capacity/runtime is accurate.