14.4V 6500mAh Replacement Battery for Roborock S7/ S5/ S4/ S6 Pure/Max/MaxV/MaxV Ultra, Q7 Pure/ Q7 Max/ Q7 Max+/ Q5/ Q5+ Robot Vacuum

After about 3 years of daily use, my S6 Pure's battery started wearing out. It went from handling the whole house on a single charge to needing multiple charges just to finish. I got this battery as a replacement.The replacement process was easy—it only took a few screws and a couple of minutes to swap the old battery. Now, the vacuum can finish cleaning the entire house in one charge again, which has been a huge relief.I also noticed that before replacing the battery, I had trouble keeping the vacuum connected to Wi-Fi. Since the new battery, that issue has disappeared, so I think it was related to the old battery's decline. Either way, this was a big improvement for our aging robot vac.

Original OEM battery was getting weak so I thought I would upgrade to a 6500mAH version. First one worse than the worn out original, I ordered a replacement (this one) also worse than original. This is junk, look elsewhere.

Super pumped this battery worked. The original Xiaomi Mi Roboto is a beast. It just keeps on going.

After installing the battery I set the robot up to clean selected rooms. Once I started it, the robot would power up, roll off the charging dock, idle for a minute and then return to the dock. My app would then get an error message, "failed to reach target". Battery was installed correctly & robot had never thrown this error before. I tried several times to power the robot off and then on again, but with the same result. I reinstalled the old battery and the robot had no problem finding its target rooms. I cannot explain why a different battery would cause the robot to throw errors, but I've read other reviews of robot batteries where folks reported similar issues. I bought this battery because the reviews were decent and those who reported issues had good resolution. I hope I do too as I'll be returning this battery.Update. At the conclusion of setting up the return for this battery, I got a message in all caps saying that it is illegal to mail a defective or damaged battery. So, I chatted with Amazon customer service and they confirmed that I did not have to mail back the defective battery and they would still send the replacement. The replacement arrived promptly 2 days later. I installed it in the robot and it is working properly. It is back to its original state where it can vacuum all 3 area rugs 3x at max power without running out of battery power. Therefore, changed my rating from 1 star to 4 stars - one star less than 5 due to the trial and error factor. But all's well that ends well.

Whenever purchasing batteries from a company which isn't the one that manufactures the product, I'm always concerned that something will be "off" just enough to make it not useful. Wrong connector, wrong size, etc.This battery fits into my Roborock S6 without issue, and it has a higher capacity; original was 5200 mAh, the new one is 6500 mAh. I'll probably not need the extra runtime, so we'll see.

Just received the CITYORK 14.4V 6500mAh for my Roborock E20. After giving it a full charge it was able to cover 41m² with 60% battery left. Basically a city apartment. I'll update my review if that changes, but so far it's great! Far better than the original did.

Went dead after 2 use.

I got lucky, this one performs just like the original so far. There is a lot of false advertising about Li-Ion batteries, so I strongly advise getting an inexpensive charger-tester to test them. This one advertises 6500mAh, which was on the low end (the original was 5200), others advertise an almost impossible 9500mAh! I tested this one after a couple of gentle cycles, and it yielded 5200mAh, which I'm happy with. It weighs 449 grams, which is about the same as the original. (fake batteries are much lighter). While I'm not happy with the 6500 rating and getting only 5200, I expected it. We need to test our battery purchases and if they're not close to the rating, send them back and don't use that seller again!