Approximately 58 volts.
The rated voltage is 48V and the rated current is 20A. Through calculation, we can know that in the theoretical state, the discharge capacity of the battery 48V 20 Ah is 0.96 degrees (rated voltage*). rated current * time = 48 V * 20 A * 1 h).
In addition, since the actual charging efficiency cannot reach 100%, only 90% to 95%, generally speaking, the actual charging capacity is 1.05 times the discharge capacity, so we can get the actual charging capacity to be about 1 kilowatt hour (0.96 degrees*1.05). In other words, 48V20Ah only requires 1 kilowatt hour of electricity from no power to full power.
Precautions for charging 48 volt lithium batteries
When charging, first connect the battery, then turn on the power. After fully charging, first disconnect the power, then disconnect the battery andthe charger. Keep the key cover closed when connecting the battery to the vehicle.
Overcharge danger: Unplug the charger in time after full charging, and do not charge continuously for more than 8 hours.
Do not charge in sub-zero temperature environments. When charging, you must use a dedicated lithium battery charger. Roadside fast charging is not permitted. 48, 60 and 72 volt chargers cannot be mixed.