Vanmoof s3 Battery - a new melty failure!

[@jessegotowork]

This is happens quite a lot. You can replace the resistors and pray the rest is okay. Usualy this heppens when a socket is broken.

[@EbikeRepairs]

@@jessegotowork I ended up replacing the whole BMS with one from another battery in this case. :)

[@Draakje9876]

I’ve had 2 of those, and both were fixable. The resistors are 150ohm each. The 3 resistors are in parallel. So the result should be 50ohm. Just replace the fuse and the resistors. And see where you end up. The PCB seems pretty resilient. The cause is likely one of the half-bridges of the motor driver inside the cartridge to be blown (N-ch Mosfets at the rear of the cartridge’s PCB) Those Mosfets usually blow up as a result of broken / shorted wires that go to the motor. So please test your battery (once fixed) in a working VanMoof, otherwise you will blow up the battery again.

[@Draakje9876]

Forgot to mention: Although heavily burnt the resistors could still be functional. Measure before replacing. If the circuit still measures around 50ohms (max 60) then you’re still good. Also at the bottom of the PCB there are additional placeholders for resistors at the bottom of the PCB. So if 1 resistor is blown (measuring ~75ohm) you could choose to solder one there without having to remove the broken one.

[@EbikeRepairs]

Thanks for the info! I found some working BMS board on eBay UK for under £100 so was happy to go with one of those instead.

[@MiniLuv-1984]

Win some, lose some.

[@EbikeRepairs]

@@MiniLuv-1984 agreed! Next time I'll get one that just needs a charger....

[@gren509]

Camera is too tight, can't see much :(

[@EbikeRepairs]

@@gren509 sorry :( I'm getting better!