Replacement Battery for Roborock S4 S5 S7 S6 Max/Pure/MaxV/MaxV Ultra, Roborock Q5 Q7 S8 Max+/Plus/Pro/Pro+ S50 S60 T4 T6 T60 T65, Xiaomi Mijia Xiaowa E4 E5 E20 E25 E35 C10 E351-01, 14.4V 6700mah

Fits my vacuum, works wonderfully! Get it.

as good as the original

Works very well with my S7+, hope can last long time

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.

I was skeptical of this battery due to all the other reviews being all over the place. I went to a bunch of other options on Amazon and ended up taking a chance on this one.I'm glad I did, as my Roborock S7 can finally clean a majority of my bottom floor of my house without having to charge. It's amazing for this 4 year old vacuum to feel new again.It could very well be a lottery type situation and I just got lucky, but my advice would be to give it a shot and if it doesn't work out return and try again.I can't vouch for the bigger capacity, but it doesn't matter to me as long as it's at least back to what I had when I first bought it.

Very good

Worked great in my vacuum cleaner

Simply go on line for an instruction for installation. Couldn't be easier. This new battery works great. More power than ever!