Xiaomi M365 Repair - BMS Fuse - Part 1

Xiaomi M365 repair - BMS Fuse Fault - A common fault on the Xiaomi M365 is no power. My scooter had a faulty fuse that needed replacing, follow all my video to see how i got on! Please leave me a thumbs up!

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[kentboehm]

Just a little suggestion, and first off, hat's off for getting in there and giving it a go. I would suggest you watch a few videos on soldering technique. It did clearly work this time but your solder joints are a bit dodgy if might be so bold as to say. The problem with a bad solder joint (like where you have soldered the main power wires to the battery) is that even if it looks ok when you do it, the structure of the joint will be poor and will be prone to failure down the track. For a vehicle like a scooter you really want to make sure you don't have any cold solder joints (where the wire moves as the solder cools from a liquid to a solid). Sorry for being pedantic but I think in a vehicle that your ride, you want to make sure your are safe!

[pishta]

a trick on desoldering fuses or any multi pad SMD/Through hole. solder a bare copper wire across the fuse ends, then just heat the wire in the middle and both ends solder pads will melt and you can flick it off. Even works with 20 pad inline switches. Good job for not being afraid to try and repair something.

[chuweeloc]

first off nice work for a newbie, I think your a natural , anyways the reading of 3.7 is not coming from your main battery, that 3.5 is a back up battery its there for GPS, if your model has GPS or not, it will have that back up batter, and that back up battery is direct you cant shut it off its a low drain … so its like a Cmos battery they last forever . and if you would have wanted to test for the complete voltage you have to pushed the power button on while having your tester connected to the R/B wires. After that you get the 3.7 plus what ever the main battery's voltage would be … that's only if the fuse isn't blown, but you will always see the 3.1 -3.7 because their is no on and off or no fuse placed in line for the back up .. hope you understood my explanation, sorry I'm dyslexic, so for me this comment took about an hour of struggle.

[WertzOne]

Lead-free solder is a pain to solder with cheap irons, also you need to apply flux to solder and it also helps with de-soldering since it helps to distribute the heat to the board and makes the melted solder stick firmly to the iron tip and that also helps with heat transfer.

[killerkrash]

A little messy but you show me how to replace the board on the battery .Bravo Chap good Gosh! great !!!! AAA++++ Job. And change the fuse

[photocornish]

great video. realised it probably isn't the problem I've got but watched it anyway, quite entertaining

[ИванМаксимов-си]

I have same problem like you at 13:30 minute, so you have after fuse repair 3.7V, after you make a pause and after you battery work well. I weld new fuse and made bms reset. Connect the connector to battery and all the same 3.7V. How do you solve this problem ?

[CCcreateinnovation]

Hi thanks for the tutorial, it will help a lot of people. Where can we buy the z fuse and temperature sensor?

[listenmullahsb]

That was some true "Made in England" z-fuse soldering there Dave.

[UGISPRO]

Seems like electric fault. If you will put a lot bigger fuse then it's should work. But good luck. You are best, love to loke thease kinda videos

[RekomenGaSih]

Better to use fuse socket, like i did. Once it happens again you just need to replace fuse from the socket with the new one.

[bigsyd]

Lol yes put a higher rated fuse in so under fault conditions the fuse won't blow but it will catch fire...love the internet knowledge

[eddyjawed]

At 13:37 when you tested and it showed only 3.7v did you get to find put why? Was that yellow main connector on the motherboard connected?

Anyway love your video man you are brave!

[GreekPcFreak]

so, it appears that i dont get this red light on the controller part too.. i only get the blinking blue on BMS, and i reset it, it gets red for 3 seconds, and then all the scooter is dead? do i need just a fuse? or do i need more parts to buy and replace? in greece it kinda sucks we dont have service near here so i need to do this manually

[JJbrosis]

Hello there where can I buy this fuse ? Please

[Cristallina]

Hi everyone, I have received my scooter and it doesn't work at all since the beginning. I have never used it and it's brand new.
It doesn't turn on in any way and the battery doesn't charge at all. The light on the charger remains green, it never turns red.
I opened the bottom part and followed the instructions on this video and others I saw.
When I plug in the wire to the battery, inside the battery I can see the red light flashing only 4 times. After 4 times it stops blinking.
I saw the connections on the battery and they seemed well fused on it. No one is moving.
What do you think it could be the problem? I thought about something about the battery that doesn't work properly.
Can someone help me?

[danielhenderson]

fair play bud, love how you butchered that fuse :D watch a few soldering videos maybe before next attempt and you'll be flying!

[maartendeville]

I had the same problem. Wouldn't turn on, battery gave 41V on the battery itself, but 3.7 at the cable from the BMS... after pushing the reset button on the BMS, readings are 41V also on the cable from the BMS and the scooter turns on again. Didn't need to replace the fuse. So i suggest pressing the reset button first :-)

[kingscoot]

Good show man!!! Great confidence builder.... It'll work out

[Tedhoffman]

You didn't get the right voltage with the meter because you didn't have the plug from the battery inserted into bms.

I hope you wrapped that battery...Good video all in all...