Xiaomi M365 Battery Issues - Diagnose And Repair

In this video I’ll show you - how to diagnose and repair Xiaomi M365 electric scooter faulty battery.
Found bad BMS - replaced with new one.
Found 9 dead LG LGGBM261865 cells - replaced with Panasonic NCR18650PF

For this repair I used equipment and products:

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[amazingmotivation]

This video really helps a lot. My scoot recently stop working and I brought it to the service center. The service center informed me that my scooter's warranty is voided due to liquid damage and was charging me for control board and battery replacement costing at around 250usd which is too expensive. After watching this I tried to diagnose the parts by myself and It was just only a bms error. I just reset the bms and it works. Thank you for sharing your knowledge

[NN]

He makes it look so easy haha.
He has so much knowledge and soldering skills and spotweldding and more needed equipment.

[lancelotkillz]

Perfect video left nothing out. Extremely detailed and thorough explanation

[benji]

Very high quality video. I really appreciate you speaking in English!

[thrn]

This was the most informative video that I've found on the matter, thanks!

[maestrovso]

A very well made diagnostic video. Not many will put the time and effort into one. Thanks

[ciprianbeniuga]

Great Video and Good explication about troubleshooting a faulty battery . You can get the rest off the cells unbalanced gest beacouse it’s impossible to perfectly match used cells with new cells . But you can grab out a good cell and make a discharge test and see how many mAh you can get and after that you can put new ones or used ones as close in capacity possible .

[hauikanamu]

Best video so far from someone who understands battery technology

[metatechnologist]

Good job on the spot welding, I was wondering if you would do that! It's difficult for me to suggest to anyone to attempt to solder these batteries. Too much heat is required and the solder is quite prone to mechanical failure. Really pro video. What would the final repair bill for a customer bringing this scooter in the shop??

[sand]

Shit, that looked easy, but I know is FAR FROM EASY IN 'REAL LIFE' 😂 you are a genius!

[svensporleder]

Danke für die sehr gute Hilfe bei meiner Roller-Reparatur 💪👍

[appleapple]

Hi, thanks for the excellent video. Quick questions, what is your spot welder? Full details would be greatly appreciated.

[DigBipper]

Depending on how long the "bad" cells were totally discharged for it might be possible to recover them. I have had luck with using a lab bench power supply to bring them slowly up to around 2.9v and then using an intelligent charger set to 100mA to go to their storage charge voltage. By this point I'd strongly recommend if the cells do take charge at this point that you then sit them for a couple days and regularly test the cell voltage to ensure they are not internally shorted before then fully charging them at their rated charging current. These cells of course may not be quite as reliable as new cells due to the over-discharge but again, I have had super good luck recovering flat 18650 cells this way.

[adamlonvideos]

Thanks, you helped me with that bsm modul reset button! Baterry showed on output 16v, but on the cells (before the bsm modul) showed 33v (discharged). I reseted the bsm modul and now flashing blue light and showin 33v on output. Many thanks

[pjbarron]

Thanks for an excellent video, with good camera work and narration. I have to check out your channel.

[Hermzkiii]

This tutorial is very accurate 🥰 my battery same there is 3 dead, it needs to replace new battery ❤️ thanks for the video

[niokolabs]

You shouldn't wear a ring when playing with battery packs!

[jordanjohnson]

Your video just helped me not have to spend 200 plus dollars on new battery

[aminerahmani]

This is one of the best quality videos i've come across on this matter, thank you very much for the detailed explanations !

[bluemercure]

Very well made video. In-depth. Highly informative. Thank you for this well thought video