Replacement Battery for Roborock S4 S5 S6 S7 Max/Pure/MaxV/MaxV Ultra Battery for Roborock Q5 Q7 S8 Max/Max+/Plus/Pro/Pro+ S50 S60 T4 T6 T60 T65, for Xiaomi Mijia E4 E5 E20 E25 E35 C10, 14.4V 6700mah

The shipment was fast, the installation was straightforward, and the charge lasts much longer. I can vacuum the full floor (~1100 sq) in one go, rather than two. I am pleased.

After 3 or 4 long faithful years of no issues with our Roborock, it kept dying while the charge was still decent, and we had to carry it back to the docking station. We proceeded for about a week and broke up the schedule to not do multiple rooms at once, but alas the battery kept getting worse. So far we have only had this for a couple of weeks but it completely fixed our battery issue. I am super pleased! I heard it was easy to install but I leave that to my man. I hope this lasts another few years. I love my roborock!

I have S4 Max I bought ~3.5 years ago. Battery has degraded to the point where it will leave two bedrooms uncleaned and go to base to charge before completing the cycle. I installed this battery, left it to charge over night, and next day at 1:30pm my vacuum wouldn't clean one of the rooms and went to charge instead. So I decided to fully charge the battery with lab bench power supply and test its capacity. With discharge down to 3.0V per cell at 2.0A of current it scored 4.4Ah. So it has ~66% of claimed capacity. Additional problem is that the vacuum won't drain battery down to zero during cleaning as it wouldn't be able to come back to the base to charge otherwise. I noticed that S4 will go charge when it reports <20% capacity remaining, and battery will have around 3.7V per cell at that point. That means that even with this capacity, voltage drop is big enough so the vacuum can't clean my whole floor on one charge. Any my house isn't that big - app reports around 55m2 or almost 600 sq ft. When original battery was new, I could set it to clear whole upper floor (55m2) and then carry it downstairs and clean additional ~30m2 (300 sq ft) without charging in between. Good thing that I can return it and get my money back. Maybe I got unlucky, but it's time to try another brand.

Works great

This appears to be a good replacement for the Roborock S4 Max battery. I was a little concerned because this battery actually weighs slightly less than the factory Original battery. Less weight is odd because this battery has a higher amp hour rating than the factory original. The battery was easy to install and appears to be working as intended. Be aware that when you remove the bottom panel from the robot vac, you will need to remove a piece of tape covering one of the screws. This will let the company know you have opened the unit. The robot vac appears to be working as it did when new. No error messages and great performance. I would recommend this battery for anyone with a similar model vacuum.

Works great on Roborock S5, a little bit more capacity than stock

Fit and worked like original after a few cycles.

After being charged overnight, battery died after about 20 minutes work. So dead unit would not return to dock. Tried charging the battery overnight again, but it did the same thing again. Don't know if it's the battery or the unit not being able to tell when the battery is getting low and needs to return to charge. Bought another battery from different maker and it works.

It is a very good choice.My robot starts working well again. Thank you for quickly delivery!

Vacuum robot was dying while cleaning with a nearly full battery. Having much experience with lithium batteries because of my hobby with radio controlled toys, I new this was a symptom of a failed battery. Popped the replacement battery in and voila, the problem was gone and my robo-vacuum was back to life. THX

This does not work on Roborock. The battery pack does not have a Battery Control Module (BCM) when you put it in a Roborock it will say battery error.

Its good!

Well packaged. I don't know how long it will last. I hope longer than the previous one from Ali Express