Solve the battery or ignition problems of your xiaomi scooter

This tutorial aims to help people who have scooter power on issue. It seems that some owners of scooters dating from 2016 have problems due to poor management of Regenerative Braking system . We advise all those who have one to put “WEAK” the level of ” Range of charge mode” in your ninebot app or mi home app

This article is a synthesis of infos found dealabs  (thanks b18685) and forocoches  for pictures

1er case, the easiest

Disassemble the protection that protects the battery pack

Without disassembling anything else, just unplug the large red and black wires from the green round control console (no need to remove the battery!)

  • Connect the power supply to the scooter as if to recharge and wait 30 seconds
  • Disconnect power cable
  • Reconnect the large red and black wire connector
  • Press the start button on the scooter

If this works, close the battery cover and set the” Range of charge mode” setting to “weak” on the ninebot or Mi home app until firmware version 1.31 is available. You can adjust your rear brake manually so that it is a bit more efficient without rubbing on the disc.

2nd case more annoying but feasible: connector desoldered

A connector has been desoldered or made a bad contact (red circle, we do not see all of them in this picture)

Check their connection and redo the solder especially by unplugging ALL the wires that connect battery to the control console and of course by locating them beforehand with a small drawing (no need to disassemble the battery)

Also check that cables are not damaged

  • After welding, reconnect the wires
  • Connect power cable for 30s
  • unplug power cable
  • Power on the scooter
  • If she turn on close the battery cover

3rd case / A fuse has blown

motor brake when the battery is 100% sent too much juice during a throttle lag) (if you are in “middle” or “strong” mode and firmware version <1.31) the system has blown the “Z” fuse ”

Detailed tutorial coming soon

 

 

318 thoughts on “Solve the battery or ignition problems of your xiaomi scooter

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  1. Hi guys I’ve had a look and checked for the light and I haven’t got the blue light just a permanent red light wen turn the scooter on. I also checked the battery, it’s deferent to the one you got as an example. It’s has wires going on to each pack. Battery voltage is at 41v. All looks good. Wen I put everything back and rechecked one thing I noticed, if I span the wheel I could hire that the wheels wanted to speed by it self. after playing with the toggle I got it to speen on it self wen I rotated the wheel and it would speed up by it self. I just touched the hand and the toggle and it stopped. It happen in a couple of time in traying. One more thing I can’t control the speed with the toggle most of the time is on full toggle that I can get the scooter to move. Do you guys had any problems with the toggle.
    Regards rod

    Like

    1. If the battery is not the standard Xiaomi supplied battery as in the pictures at the top of this blog, then it will be very difficult to help. Can you post a photo of the battery somewhere?

      Like

  2. Hi everyone.
    I just bought my Xiaomi scooter, assembled it and it doesn’t turn on at all.
    I push the button once, twice, keep pressed, nothing happen.
    I have attached it to the electricity for several hours and the back light doesn’t bling at all when it’s plugged in.
    It seems it’s completely off and out of order.
    I contact the seller to see if he can replace it with a new one. In the meanwhile: My question is: if I open the battery pack in the lower part will I have problem with the warranty?
    I can try these steps but I don’t want to risk.
    What do you suggest?
    Thanks for your help.
    Cristina

    Like

    1. Oh, sorry to hear that. If it doesn’t do anything I believe disconnected cables cannot be the problem however you can unscrew the bottom panel a see if everything is connected. You might see error code as well. Good luck!

      Like

      1. where can I see an error code? I haven’t turned on my scooter any time. I never used it. It arrived like that!

        Like

  3. 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?

    Like

    1. It’s definitely a problem with the battery pack so you should get the seller to replace or repair the battery under warranty.

      If he will not and if you can’t get your money back, then you will have to open the battery and repair it as shown at the top of this article. We can help.

      Like

      1. Thank you Peter, I will try my best to have my money back, a new scooter or at least a new battery pack. I believe the problem is only about the battery. I opened the battery part underneath the scooter and I followed all the instructions given here.
        The fuses seem fine, no one is moving. The battery produces a red light blinking only for 4 times when the scooter is attached to the electricity. Then it stops and nothing else happen.

        Like

  4. Problem communication :code 21
    I ve got problem since one week on my scooter.Code 21 For information,I ve bad connection on BMS board( connection on flat cable between battery and BMS).

    Like

  5. Hello Peter. My M187 BMS has problem the red led blinks 3x shorts and 1x long. Battery voltage is 40V before BMS but voltage on XT30 is only 20,5V. Is this a problem with broken U4/U5 ICs ? What to measure to verify it ? Thanks

    Like

    1. This is likely to be one of the 11 cell monitoring tabs disconnected as in case 2 at the top of this blog. As well as the 40 volts from the thick black and red wires, the BMS needs to see the 10 individual cell voltages from connections B0 to B10. The most usual one to fail first is B0 which is next to the rear wheel and often caused by using solid tires or too high tire pressure. Please remove the protective shrink tube from the battery and check these 11 connections carefully.

      If U4 and U5 ICs fail short, you will not get any lights at all on the BMS

      Like

    1. Maybe so. But do those same voltages reach the BMS along the ribbon cable and through the connector? Measuring at the tabs doesn’t help if a tab is not connected to the BMS. Just check all 11 are properly welded to the PCB.

      Like

      1. Thanks to Conejo, I’ve been measuring the voltage on each pin of J2 connector on the flex cable all is OK. I’ve been measuring the resistance between the B0-B10 PCB points.

        Like

    1. OK, so it isn’t the most obvious cause but the BMS is detecting a fault and is switching off the supply to the XT30 connector. Other causes can include broken connection to the two thermistors but difficult to diagnose at a distance. The processor must be running in order for the red light to flash. You are probably not in a position to do what I would do next which is to change the BMS board and see if the fault clears or remains.

      Like

    1. Hello, Peter i bought corrupted Xiaomi mijia M187, long story, I have been tricked…
      Battery protection circuit board(BPCB) blinked only red 4 times, so I thought it was board I ordered a new one. And change it. After new BPCB it is the same, 3 short blinks and one long after on that board. M187 is in 10s2p configuration, instead of of M365 which is in 10s3p. I measured voltage, between B0 and B7 it is around 2.3V B8-B10 is 1.0V, total about 22-23 Volts. All velds and joints are ok. And I dont know where is a problem.

      Like

      1. I’ve seen this once before. The scenario was as follows:
        The owner disconnected the thick battery leads in the wrong order leaving the ribbon cable connected. This caused U4/U5 to fail short circuit (these chips are additional over-voltage protection circuits). When U4/5 were short circuit they slowly discharged the battery until the voltage was too low for the BMS to operate at all.
        His wasn’t as bad as yours and cell packs 8,9 and 10 were still above 2v. The solution was to charge each of the cell packs individually until they reached 3.2v and get them as balanced as possible. Then a push on the reset switch and all worked
        In your case, I don’t whether cell packs 8,9 and 10 will recover from such a low voltage. All you can do is to try. If they just get hot and the voltage does not rise, then you will have to replace those six 18650 cells.

        Like

      2. Hi Netko Nesto,
        for information, If the red light flashing 3 short times and one long , that indicate the balancing on the B0–>B10 is wrong.
        On the board bms ,If U4 or U5 are faulty(short circuit on input voltage),discharge element on the battery.
        If you had change the board and the the red light flashing again check balancing on each point .

        Like

  6. My M365 stopped working. I replaced the mother board but it did not help. I can turn it on and off and turn the light on and off. When I press the accelerator button nothing happens. While poking around I noticed that my brake light wire was abraded, so I unplugged it. Will that have anything to do with the main problem? Also, the small led indicator light on the battery pack blinks a steady blue light. Thank you!!

    Like

    1. Just checking the obvious: you are moving the front wheel when you press the accelerator? The M365 will not go from a standstill. The steady blue light means that the battery is fully charged. It blinks slowly when operational, fast when supplying power and red when it’s charging.

      Like

  7. Hi
    I have a new m356. The item was used for a single journey and now reports a fault when it’s turned on.
    It has one long beep, and five short beep. (I think this is error code 15). Any suggestion how I can fix it?

    Like

    1. This means that the controller has detected that either the brake or the throttle lever is pressed. Make sure both have returned to their normal position. It happened to me when I hung a shopping bag over the handle bars and it pressed the throttle slightly. If both levers are properly released when you turn on and get error 15, then the scooter is faulty and you should return it.

      Like

  8. Different issue here; my m365 turns on, connects to my phone, all good. But the motor doesn’t engage. All cables seem to be well connected. Could there be an issue with the throttle? Or is it more likely that the motor is defect..

    Like

  9. Hi Peter,
    I had blown fuse problem and repaired the fuse and after a few kilometres again. Battery and main unit were broken. It was impossible to repair and I replaced a battery and main circuit unit. and the scooter now works for almost a year. But I have a problem with front light. After last replacement of battery and main circuit the headlight is not working anymore. I tought it was also blown LED, so I replaced the front headlight, but the new one also doesn’t turn on.
    Is it the bluetooth circuit to replace too or you thing that I have installed main circuit with headlight problems?
    Main question, what to replace that my headlight will be working again?
    Thank you in advance!

    Like

    1. I’m sorry, BB, I haven’t come across this fault. However, the proximity of the headlight to the Bluetooth/power button makes it seem reasonable that the latter could be the problem. Sorry I can’t be of more help.

      Like

  10. I was wondering if anyone has experienced their scooter accelerator not going back up and therefore not stopping (unless using brakes or manually lifting it back up).. only been using for two weeks so a bit upset and worried that I will not be able to stop at roadsides.

    Like

    1. It happened to me after the scooter fell over and pushed the rubble hand grip further along until it was rubbing against the accelerator. This was easily fixed by moving the rubber away from the accelerator.

      Like

  11. My problem with my scooter is that sometimes after i turn it off (after ride) i cant turn it on again untill i plug in charger even if battery almost fully charged. Plugging in charger almost every time helps but sometimes i cant even charge it (charger LED is still green) and i have to do 1 case solution (unplug the large red and black wires and recharge for 30 seconds) and that will help. i looked to KERS settup and it is low. I tried to messure battery with voltmeter from unplugged Red/black wire and it was 36.1V. I tried to downgrade bms 115 to 107 but did’t help. I dont even know what triggers it beacasue sometimes i can do few rides before “cant turn on” bug appears. any sugestion would help. 🙂

    Like

    1. I think you have a broken connection inside the battery as in case 2 at the top of this article. The break is intermittent so that it touches most of the time but breaks occasionally, causing the BMS to detect a battery error and shut down until reset by plugging in the charger, The most likely poor connection for this is B0 (the one nearest the back wheel).

      I suggest you remove the battery and the shrink wrap tubing and lift each tab with a small screwdriver to see if any are loose.

      Like

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