energup 14.4V 6500mAh Li-ion Replacement for Xiaomi Battery Mi Robot for Xiaomi Mijia Roborock S50 S51 Robot Vacuum Cleaner for Mi Mijia Battery

As expected this battery fit my Roborock S4 Max and I suspect it will fit other models as well. In case your particular model is not listed ( a common omission) just remove your old battery and compare it to the photos of this battery paying close attention to the shape and plug details. My original Roborock battery was showing reduced run times and usually could not finish our 926 sq. ft. area. The original battery had an accumulated 303 hours and 200 thousand sq. ft. of service life but now needed to be replaced. Questions are: Does this new aftermarket battery work and how long will it last before needing to be recharged? In my case the answers are Yes, it does work and my vacuum ran for 82 minutes, vacuumed 926 sq. feet and returned to the dock with about 40% charge left. So all is good at this early stage. Considering the games that are played with aftermarket power and life claims I'll wait to see if how battery compares to the original OEM one.

I have a Xiaomi vacuum robot 1, which is pretty good but it is already very old. Lately, It started not to finish a single cleaning and was just shutting down without any reason. I bought this battery as a replacement which fitted just as an original one. 1 to 1 as it's native one and after that all is fine. It keeps I guess even longer battery life than I had when I bought the vacuum. So I am very happy with this purchase.

UPDATED REVIEW: While I originally had some challenges with the first battery, I reached out to Energup and they happily sent me a brand new battery to resolve the issue I was having. The new battery works great! ORIGINAL REVIEW: Bought battery to replace in my Roborock S5 that consistently had low battery warnings. Swapping out battery was quite easy. However, even though this battery is supposedly rated higher than the original at 6500mAh, the Roborock still has low battery issues on every cleaning. My assumption is that the battery isn't actually 6500mAh.

This battery fit perfectly into our Robotic. Now itlasts longer than before, got new rollers too. It was easy to install

The battery worked fine in the beginning but 1-2 months later would not take a charge. By then it was not returnable. Contacted the manufacturer and sent 3 emails. No response. Update - They finally contacted me and offered to replace the battery but I already had done that so they gave me a full refund. 5 stars for service but the battery still quit. At least they made it right. That’s what matters.

Battery size: Battery suggests a higher Wh than the stock battery (5200 vs 6500), so time will tell how accurate that is. First run was able to complete my house in one pass like the old battery was Quality: I find most 3rd party batteries are of lesser quality and last shorter before degradation. Multiple review sources confirm this as well. Time will tell with this one. Value: $44 to restore the battery life suggests a good benefit to cost ratio to me!

Give a second life to my robot vacuum cleaner that was getting old and had to make a pit stop at the charger station to clean entire one bed apartment

The battery fit perfectly, and was easy enough to install. Unfortunately the longevity of the battery seems to be much less than the original installed battery from roborock. The original had lasted over 7 years of daily use, whereas this one is failing after only 14 months of light use. (This vacuum became my second vacuum after upgrading early last year, and was moved to a much smaller floor plan in the house). I recommend a different vendor.