Xiaomi M365 range problem - diag and repair

[@express496]

The reason why battery pack 2 has a higher voltage is because its more worn and so charges quicker. That is why even after the first discharge the battery pack 2 still advanced faster than the others indicating the wear.

[@express496]

lol nvm watched the followup

[@kingscoot3009]

Thank you, you're my kinda n.e.r.d , honestly, thanks for your work! Applause....

[@alejandrogreco]

instead of doing all this wouldnt it be easier to just let the battery completely discharge by either running the motor free or letting the LEDs on until it is ocmpletely drained?

[@davidolsonfeld2053]

yes

[@daveroche6522]

Excellent - very informative. Thank you.

[@shelory]

why didn't you just empty all of the cells (by running it) and charge it up from there? or would it not have discharged all of the cells because some are empty?

[@octapc]

The full discharge voltages of each cell would be different for each just like when they were fully charged. His method is spot on

[@lucacavallini561]

Hi, in the video not see clear, you connect the 3 Cell of the battery to terminal of battery slot inside the led Torch?

[@maxlisska]

What nice looking internals. My guess is that cell is bad and has lower capacity and thus charges faster. It is not your fault this is a balance​ issue. You could make a BMS easily. I recommend it.

[@DougHnut]

I agree that is the problem. the battery is in a 10s3p configuration, so likely 3 cells are the problem. i some better 18650 cells on order to replace the faulty cells. i guess i could add a 10s BMS from ebay to this battery, but i would only use it to charge the battery. the stock BMS has 3 signal wires going to the controller, likely to tell it information(cell voltages, temp etc..) about the battery pack. i don't want to lose that info.

[@mvarcadia]

Doug, you sound like a techie! See this document for full details on the sophisticated BMS and see Figure 8-2 for circuit diagram of most of the Xiaomi BMS board: www.ti.com/lit/ds/symlink/bq76940.pdf But do remember the BMS relies on being properly connected to a battery pack that has all its 10s3p connections intact.

[@nightmareinaction629]

42vdc wont shock you

[@estacionsj94110]

Were on the ninebote app is the individual cell information.I downloaded the app and cant seem to find thae individuale cell information

[@GalacticTechTrails]

Nice video thanks

[@ericsonlacap6356]

Hi what is the standard volta of single battery of xiaomi m365. Thank you

[@otiks]

Hi. Thanks for the video. Did the battery fix work and increased it back 22 km?

[@DougHnut]

+otikzs unfortunely not quite. I have been quite hesitant to draining the battery down past 10%. Im still slowly doing some test to see if this made an improvement. So far it is not as good as new. Ill let you guys know after i collect more data.

[@sharisoriano9096]

Doug Hnut how many months are you using it before you noticed the battery problem?

[@DougHnut]

+shari soriano 2 months. Right after my off road trip. Which i have a video of that ride in my playlist. It was not meant for that kind of riding haha

[@motherswizard2930]

Help Doug, my scooter is not charging again all because I left it for a long time, please what can I do to it, can you please list all the tools I need to troubleshoot it, or should I go for another battery???

[@vivamoment]

Hi Doug Hnut, your videos are great. Thank you. One question, and I do realise that your video is over a year old, but does the current Mi Home app still show the breakdown of the Battery Cell pack voltages? I can't find it anywhere. I can only see the total voltage. Also it seems the that Ninebot app no longer connects to the M365 stating that it does not support that model scooter. Do you know anything about this?

[@DougHnut]

they stopped displaying the breakdown. on the android appstore, there is a app called "m365 battery" that will do the same

[@vivamoment]

@@DougHnut thanks. Also when I charged my m365 the other day, at about 100% the four lights on the handlebars started flashing in unison, and the tail light was flashing too. Is this an error sign or is it normal? I can't find anything about it in the manual. Also the first charges of the m365 I left the scooter and returned after it was fully charged and the lights had all turned off

[@motherswizard2930]

Is the M365 battery app on Apple store???

[@doncodman913]

Hi Could you show a close up of that fuse on the board please. rgds Don

[@xerejuneseve6333]

Balancer,BMS should regulate all battery cells voltage on charge and discharge to..

[@excelleflores2327]

can i let charging process in the whole night? or will damage my electronics board component in my scooter?

[@chillyboy2008]

what you do if you have the opposite problem, a pack si lower than the rest, i have a lithium charger, can i charge the pack with that? while conected to the rest of the packs?

[@themaximussx875]

Hi Nice video, would you know whats the individual cell values how many maH each? Is it 3900mah?

[@DougHnut]

2600mah each cell

[@sparklauerei1]

My scooter stops charging at approx. 4.12volts is that normal? all cells are ballanced at 4.12

[@nilsfrahm1323]

yes, I think. Newer BMS firmware from xiaomi limited the max voltage, so now 100% is like 94% from before. This helps protect battery, allows more cycles because batteries are not sitting at full charge. It lowers the scooter range a bit, though, but you woukd be able to use it longer time. It's possible to flash older BMS version, to regain your capacity, but will be tougher on your battery.

[@rumendimitrov89]

what app do you watch these volts?

[@happydaydreamer1]

Are they using unprotected cells? This is why I would pay 20 dollars more to get each cell with protection inside battery. Then the BMS does not have to worry about each cell, just cutting charging power when current is zero. I wish though they could produce protected 18650 cells with a pre-set cut-off @ 4 volts. I would definitely pay more for this, even if capacity is lower. That would mean that the battery pack would keep a good charge for many years. Using a lot of 18650 cells and with my charger programmed to 4 volt cut-off my 10 year old cells only have lost 3 percent (of 4 volt capacity). 4.2 volt charged batteries gives way less than this in just a few hundred cycles (all original Panasonic NCR 18650B protected and unprotected).

[@gpa30051984]

Shouldnt BMS prevent this?

[@DougHnut]

its only on the mi home app. but im not even sure anymore because recently i haven't noticed the individual voltages anymore on the mi home app

[@PqKiller25ToLife]

you have to change the apps region to USA in order to see the extra features of the cells, ... I had Europe region i randomly changed it to United states and noticed the feature.

[@skytte71]

@@PqKiller25ToLife I live in Europe, and when i change to region USA, it cant even find and connect the device via bluetooth? I have tried several times, even turned off and restarted the device and the app first, but when i try to connect the device, it just searches until it finally says, that it cant find any device...

[@PqKiller25ToLife]

@@skytte71 make sure u dowloaded the right app, or if it needs to be updated, the apps icon is green.

[@taylorwhite3636]

You can check the individual pack voltages still using this app -- play.google.com/store/apps/details?id=com.m365downgrade I'm having the same speed issue... I think all voltages seem fine (all packs right around 4.05V), tire pressure is good, eco mode is off. Sucks, IDK what to do.

[@PeppePascale_]

I have this exact problem from One month, didnt understood where to connect the light for discharge.. do you have any suggestion?

[@sparklauerei1]

Why did that happen in the frist place? The BMS should do that? why did it get unbalanced?

[@proxyhx2075]

Watch the video carefully, all those questions were answered.

[@SayWhaaaaaaaaaaaaaaaaaaaaaaat]

Correction: It's high current and low voltage. :) Anyway useful stuff!

[@MaltePersike]

Yikes, did that screen crack on your smartphone happen during the long trip mileage test when the phone fell off?

[@DougHnut]

nope, the glass screen protector was already cracked from before. my phone is using a spigen phone case and i love it !

[@arnolddomingo7567]

You could always add an active balancer.

[@ciupik8571]

hy ! on my m365 tools app , the battery shows with red , cell 1 with difference of 0,021V from the other cells. sometimes other 2 cells are doing the same. any ideas ? thanks and great videos about the scooter !

[@proxyhx2075]

That's perfect, seriously nothing is wrong about that.

[@mikecane]

Yecch. Not everyone is an EE or even has alligator clips. Very few people could diagnose or even try to repair that problem. I hope you're the only one to have it (not that you should!).

[@DougHnut]

+Mike Cane i am no EE, lol. I diagnose/repair car problems as a day job. But thanks!

[@notturno11]

I think i have the same problem, my battery range is very low, and don't know what to do. The scooter also switches off and sometimes I can't restart it without plugging it again.

[@DougHnut]

+Gianluca Maggiarra i just made a updated video to this issue, solving the problem

[@RadiantFreeEnergyResearch]

Great video! Thank you for taking the time to explain this in great detail. I will look for the update video now, thanks again!

[@XpDark]

Pack 2 have all the time a higher voltage... Mine is new and is the same. I have a m365 pro...

[@djjjozsi]

Hello Doug, may i ask from you something. I have the opposite problem. My all batteries have 4,140 V, but the Cell4 is a little but under4,112 V. I have a 18650 battery charger (0.5A), do you think i can charge this low cell with this to make it balanced? Thank you for your kind response.

[@george-broughton]

Yes you can. Though this may be an indication of a failed cell that has a high leakage current which means it's faulty. If left unchecked, this could lead to fire, though it's unlikely to happen if it's slowly dropping in voltage. It's probably going to get warmer than normal when charging though. I would recommend leaving it a day. If it drops further then one or more cells in that parallel section need replacing. It may be your BMS that is bad too, because it should be balancing the cells. Check the resistance of all connections to the BMS. If it's offscale high, then you need to find where the break in the circuit is and repair it. In theory, you may be able to see which cell is bad just by pointing a thermal camera at it when charging. I would note this isn't recommended. Especially if you're charging at a high current.

[@Egge33]

In my "MiHome" application I can't see the Battery Cell Pack?

[@DougHnut]

+Egge33 what version firmware do you have? Im currently on 1.3.4. If you still cant find it ill make a quick video to show you where

[@kentboehm1981]

Do you know if 1.3.4 fixes the fuse problem on braking? I have an M365 on the way from Banggood and I want to pre-empt any problems.

[@DougHnut]

+Kent Boehm yes. I heard anything after 1.3 does. Mine came from banggood with 1.3.1. So im sure you will be fine.

[@Egge33]

I checked already. Only. With Android you can check the cell power!

[@taylorwhite3636]

play.google.com/store/apps/details?id=com.m365downgrade download that App. It will show you the battery pack voltages

[@guillaumebreton1369]

Hi Doug, Same problem here. Cell PACK 2 going a lot lower voltage and faster than the orther when i run the scooter. Should i replace these 3 cells? by what?

[@DougHnut]

i have an updated video for this issue, check out my playlist

[@Busta033]

I have totally the same problem After ride cell pack 2 has 0.2-0.3V lower voltage, after charging it is equal, But my scooter sometimes wont turn on. I have to put it on chager and then It turn on. Guess some bad connection to pack 2

[@themaximussx875]

BTW Thanks so much for the answer. :)

[@ΝίκοςΠαρασύρης-ο6μ]

Hi guys. I just repaired the Z fuse of my m187. The led turned blue but the scooter isn’t turning on. I tried the battery to a friends m365 and the battery works. Any suggestings what to check-fix on my m187? Ps: when I am trying to power up the scooter the led blinks some times but the scooter remains off.

[@rickrandom716]

wait! so you got 15 fiscally cells but the app shows only 10?

[@DougHnut]

rick haro there is actually 30 cells. The cell arrangement is 10s3p. So 10 groups of 3 cells

[@rickrandom716]

Richard Adams ok i thought it was 15 x 2.

[@burtonpunch007]

How do you see each the voltage for each pack? I can only see the total voltage...

[@Bergwacht]

use the "m365 tools" app

[@weswalker1208]

I was under the impression when you had a cell balance issue the way that you repaired it is to run everything down dead. And then put a draw on it and suck out the rest. Then when it recharges from absolutely zero they will charge evenly as long as connections are good and otherwise healthy cells are present

[@marcos007ish]

What's the best and fastest way to drain battery?

[@TJ-pk2vu]

Any way to charge without the power supply? Mine was stolen.

[@DougHnut]

no, unless you have a 42 volt power supply and are willing to take the battery cover off every time you want to charge. better to just buy another charger. bit.ly/2NskGkY

[@kentboehm1981]

You have to ask why this happened though. Does the battery have balancing circuitry built in? It certainly should!

[@DougHnut]

I first noticed the range problem after my off road trip that ended with a dead battery. So likely the problem was caused by draining the battery till the scooter wouldn't move anymore and leaving it powered on 10-15mins afterward. The battery does have a BMS, but it does not balance charge the batteries. The BMS only prevents over/under charging.

[@kentboehm1981]

Ahh ok, so avoiding over discharging would probably help avoid this situation. Cheers.

[@mikecane]

>>> The battery does have a BMS, but it does not balance charge the batteries. Uh-oh. I'm seeing charge balancing claims from other eScooter makers in China. If Xiaomi doesn't have it,. it's likely they don't, either. Yikes! This could become a very big problem.

[@mvarcadia]

Oh, you're very wrong. The BMS does balance charging using Texas Instruments bq76930 chip - PROVIDING the cells and cell packs are all connected properly and all the sense wires are connected.

[@mikecane]

Ah, that makes sense. If it's not programmed for that possibility, the balancing will go out of whack.

[@pigzip]

What firmware? Why you have voltage on cell?

[@DougHnut]

v1.3.4 i think only android version of the mi home app shows voltage of each cell pack

[@RadiantFreeEnergyResearch]

Doug Hnut Thank you Doug, I was wonder why my iPhone wasn’t showing cell voltages. After reading your comment regarding the possibility of only the Android mi home app showing cell voltages to a greater extend of detail, I found my old android phone and download the mihome app, and it works! Thank you!

[@RadiantFreeEnergyResearch]

Doug Hnut Also, you have greater knowledge of the M365 scooter than I and thus I seek advice from those that know more than I. My question if you would consider it, I’m adding a solar charging trailer to my M365 scooter and need to know the best place to wire my Genasun MPPT Lithium Boost charge controller to. The solar panels will connect to the Genasun (providing 41.7 volts for a 36 Volt nominal battery) and the Genasun will connect to the battery. It looks like I can plug the Genasun into the XT30 connector that connects the 36 Volt scooter battery to the scooter. Is this the best place to add charge back into the scooter battery while riding the scooter? Please respond with the greatest possible detail. I’ll await your response with great optimism, enthusiasm and interest. My girlfriend and I are doing this project together, and we are learning a lot in the process. Thank you in advance! PS: We learned about this solar charging while riding a bike or scooter by watching all of Marissa Muller’s videos here on KZbin. She cross the country with 240 watts of SunPower solar cells, two Genasun MPPT boast chargers, and a 250 watt Schwinn Specialized model S.

[@Egge33]

My Scooter firmware are 1.3.4. And I use IPhone with "MiHome" Maybe only works on Android?

[@DougHnut]

+Egge33 possibly. I dont have an iphone to try with right now. Ill ask my buddy to try tommorow

[@phowshow5991]

my m365 a prpblem that i could not figure out, it full charbe at 2hrs, 5 of the batteries at 3.7 or 3.9 vlts the other 5 are at 4. something.

[@mdabdullahalsazzad3008]

Hi, did you get any solution of it? I am having the same problem.

[@aragorn318]

Hi guys, I just got my M365 scooter and been riding it for a week now. Quick question, does anyone here know if it's optimal to charge it after every ride, or should I wait until the battery goes to at least below 50% before charging? Does this even matter? Is there such a thing as a maximum number of total charges within the batteries?

[@DougHnut]

i find it best to charger after every ride except when the next ride starts with a long downhill, because the regenerative braking will not work until you've used up a bit of the charge. it scared me the first time that happened, had to put my foot on the ground to help me slow down. lithium ion cells don't suffer from frequent top ups. using up 20% and charging it back up is better than using up 80% and charging it back up. enjoy your scooter and thanks for the sub!

[@aragorn318]

Thanks for this video. I also use my scooter to ride to work and back and my ride is also less than 5km each. But the 3 times I rode it to work last week, I noticed that my scooter went from 100% battery to 71% my first ride, then 66% the second ride, and down to 64% my last ride. So I will also need to do this battery analysis like you.

[@aragorn318]

I just checked and I have 41.35 volts at 100% power so the battery seems fine. But I can't get my app to display individual cell power. I have version 1.3.3 firmware and my Samsung S8 says that this is the latest version. I have Ninebot and Mi Home apps installed by the way.

[@DougHnut]

mine fully charged and still connected to the charger is sitting at 41.55v. you really need to see individual cell pack voltages to really know if there is an issue or not. Only the mi home app can display the individual cell voltages. you should be able to update to 1.3.4 through the mi home app. and im am using a Samsung S7

[@aragorn318]

I'm not sure what the mi home app is doing for me. When I go to my ninebot app and pair my scooter, then I go to my mi home app, I can see that my Mi Scooter is online. But I can't click into my Mi Scooter and I don't see the menu screens that you see in the mi home app.

[@danny355]

Interesting, mine never gets to 42v even from new. Gets to about 40.5v

[@dummydummy1421]

Shitty BMS or bad quality cells

[@mashedpotatoes5323]

@@dummydummy1421 it would be the bms

[@sisqoszilard]

I did the same cell discharge with a leds and now the complete battery pack looks dead. Main cables have 40V every cells are on 4V and the smaller red black cable has an output of 3.6V The bms has no flashing lights no red no black… Anyone any idea. I wish I could've not touched a thing and live with 50% performance… :/

[@DougHnut]

there is a reset button on the bms, have you tried that?

[@sisqoszilard]

Doug Hnut yep, thanks. No luck. At the moment: my bms has 4 red flash and doesn't work. Fuses are ok. Thermal sensor is in the range 8-10. The power output is 3.6v on the top of the batteries the voltage is 39.9V. I guess I should measure all components on the bms to see what is wrong. I am too newbie to these so I am asking where would you start checking the possibly faulty piece on the board and how?

[@taylorwhite3636]

@@sisqoszilard Damn. Did you end up fixing it?

[@sisqoszilard]

@@taylorwhite3636 yep, was difficult and ended up with changing u3 u4 and u5 chip on the bms… battery is still on 50% tho…

[@atomek1000]

This is just bad cell. nothing to do with you running it down to 0%. Just random bad cell/failure. You can replace this section with new cell but its going to be hard to dissasemble the battery. Just ride it till it has unusable range for you and then make/buy a new battery pack

[@DougHnut]

It ended up being one of the battery spot welds breaking off. I have since soldered it and have been using for awhile now with no issues.

[@whazzat8015]

@@DougHnut strong work! good diagnostic vid check out endless sphere for info on bat care

[@ShowAnNDTeLL]

Reset the bms

[@ricardoduarte4193]

Doug can you send me you mail to I can send you a image of my battery cells and you could help me to solve the problem at my Xiaomi 365 young version.

[@DougHnut]

[e-mail]

[@m.f.m.f.3044]

Battery Cell Pack2 most likely has a bad battery. therefore this pack fills up faster. check the individual batteries in pack 2

[@SayWhaaaaaaaaaaaaaaaaaaaaaaat]

XIAOMI BALANCES BATTERIES. JUST CHARGE YOUR SCOOTER TURNED ON.

[@rupertboston4571]

Is that the best way to charge it with it switched on?

[@aragorn318]

Are you sure because this whole video is about the problem that Xiaomi doesn't balance the batteries

[@mashedpotatoes5323]

That doesn't make sense, the bms is on the battery, when you charge it the bms does all the balancing not the other components of the scooter. The issue is the bms is probably a piece of crap.

[@bswindol720]

The BATTERY is TERRIBLE. FORCED ADVERTISEMENT!!!....P.S. GOOD SCOOTER shitty Battery