MakeSure all of your connections are secure and not loose you’re charging Cables should look like they do in my video and should be connected accordingly ! A constant red light (on the bms)is a bad sign that your battery is malfunctioning and having issues,It could be something going on with the battery management system (bms) or one of the component on the board like Or it could be one of the battery cells inside the battery pack having an issue or could be unbalanced Somehow ,This video also shows that your scooter should charge without issues also without anything having to be done to the scooter itself.So again be sure that your connections are secure/nothing is loose.Also Something I did not include in my video that I had a problem with on one of my scooters may also be related to this issue.Follow that black and red wire going up to your charging port ,Lift up the charging port flap And there are too small screws That need to be undone..Take that apart and make sure that both positive and negative prongs They are pushed in all the way ! Sometimes they push out of place after charging the scooter so many times..iv had this happend before ..

Your Battery could be under voltage also so be to check that as well .

You could also reset your bms Externally

The first method for resetting your e-bike battery’s BMS is to do it externally. By that, we mean performing a reset without opening the battery compartment and accessing the BMS directly. To do that, you’ll be using a makeshift adapter to charge the battery through the discharge port, which should cause the BMS to reset itself. You’ll be working with a soldering kit and later with live electricity, so you’ll want to keep yourself protected at all times.

Your adapter will consist of the DC barrel jack and two wires. Using the soldering kit, attach a red wire to the positive terminal of the jack and a black wire to the negative one.

You could also use electrical tape to keep it all together and cover any bare parts.

Remember: red wire to positive, black wire to negative.

You must never let the bare wires touch each other, as that could close the circuit and make things very dangerous.

Perform The BMS Reset

Next, connect the adapter to the battery’s discharge port. Look closely at the port, and you’ll see that it has indicators to show you where to plug each wire. It’s usually printed on the plastic itself. The red wire goes to the positive terminal, and the black wire goes to the negative one.

If it’s working, you’ll see that the light on the charger turns red. Hold the wires just as they are for 15 seconds, and that should cause the BMS to reset itself.

Once that’s done, turn off the battery charger and remove the adapter. You can now check to see if the BMS allows the battery to charge and discharge as normal. You can do this by replacing the battery back in the e-bike or connecting it to the charger.

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