Electric cars can change from 36 volts to 48 volts.
Without changing the charger circuit. If the charger is a 48V electric charger; The simplest way is to add a battery to the 36V system and turn it into 48V. If there is a circuit diagram, it is best to change the charger.
If it is a brushless motor, change the 48V controller and a battery can be, the speed is also fast, but also strong.
If it is a brush motor, do not change it, it is easy to break after changing, especially the carbon brush is the fastest.
The battery life of electric vehicles is related to electricity, not voltage, and if it is replaced at will, it may damage the engine.