If your e-bike batteries is failing due to overcurrent protection, there are some tests you can do before replacing your BMS for ebike battery.
- First, try “jumpering” the battery’s BMS. Jumpering a battery sends a signal that triggers the BMS to reset. Different batteries/BMSs have different protocols, so check the wiring diagram that came with the battery or consult your battery supplier.
- If that doesn’t work, you can do a more extensive test of the e-bike battery pack and BMS. The core is to check the voltage of the individual battery cells (make sure they are in the 3.6-8V range) to make sure no batteries are dead.
- If the e-bike battery is dead, you can replace it, which may cost about $15-$20 in parts (and will also require a spot welder and some nickel tabs).
MORE: How to install a new e-bike BMS?