Kekwa
Likely the faulty charger causing premature failure of the battery.
Also another problem with direct hub motor like that. While conventional ice vehicle has a separate transmission that you can decouple the wheels from the engine (neutral), an ev like this likely has hub motor. While it's easier to implement regenerative braking, also likely the neutral is not true neutral but active neutral. Need a complete circuit to engage neutral otherwise it just default to "in gear" or lock.