Sourcing good quality replacement battery for original Xiaomi Mi Robot Vacuum

Forums › Gadgets, robotics, home automation, electronics (including wearables) › Sourcing good quality replacement battery for original Xiaomi Mi Robot Vacuum

gbwelly

1238 posts

Uber Geek

#304548 14-May-2023 14:37

Greetings.

I know a lot of you are very experienced with lithium ion batteries. I am looking to replace the battery in my OG Xiaomi Mi Robot Vaccum. The part number is brr-2p4s-5200s.

Can anyone advise where and what I should buy to not get sold a lemon?

The sellers advertising replacement batteries love to use the word 'original' in the title, but in my mind that is a different thing to the word 'genuine'. I am resigned to likely resorting to an aftermarket one but would like to actually get 5200 mAh, decent brand balanced cells, and a charge controller that doesn't catch fire.

Cheers!

ashtonaut

614 posts

Ultimate Geek

#3101144 8-Jul-2023 06:41

Did you ever get this sorted? I’m acclaimed in need of an OG replacement.

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chimera

506 posts

Ultimate Geek

#3104860 16-Jul-2023 20:32

I can simply add… do NOT buy this. I thought higher mAH meant vacuum would run longer before needing recharge. Not the case. Plus when it’s about to go flat it dies so fast vacuum doesn’t have time to return to the dock to recharge.

https://a.aliexpress.com/_m09OBIq

gbwelly

1238 posts

Uber Geek

#3104909 17-Jul-2023 08:11

chimera:Plus when it’s about to go flat it dies so fast vacuum doesn’t have time to return to the dock to recharge.

This is interesting. My situation was that initially my unit was stopping and returning to the dock half way through the clean-up for a nap, before resuming and completing the cleaning. Then it progressed to just dying mid clean. This is what prompted me to purchase the new battery, I had assumed the two things were related.

However... with the new battery it is still dying after about 20 minutes of cleaning. Docking it causes it to boot up, at which point there is still capacity in the battery and it can be instructed to clean again. I believe there is some sort of resettable fuse blowing.

robjg63

4087 posts

Uber Geek

Subscriber

#3104959 17-Jul-2023 10:24

Probably doesnt help you too much, but it does appear that maybe that battery pack can be opened up and cells replaced inside:

(though some packs seem to be filled with glue!)

...Though where you could buy good quality replacement cells, I don't know.

It is pretty much impossible to tell what is junk and what is not on sites like Aliexpress etc.

Even higher price doesnt really indicate better quality unfortunately.

Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler