This project's main goal is to, by small and simple modification, to extend balance scooter's range. As a balance scooter owner, small range of 10 kilometers per charge is barely enough (they say 20.... Liars). All scooters have the same 36V 4.4Ah battery. I am going to make an additional connector for external battery (held in backpack) with much higher capacity (and I have to add a switch for an old battery because of different capacities).