It is essential that you look after battery maintenance at regular intervals. This is particularly important during the off season, when you are not using your bicycle for long periods. 36V Battery: Your battery must maintain a minimum voltage of 30 volts. If the voltage goes below 30 volts, the battery could become irrecoverably damaged and might no longer be able to accept a full charge. 48V Battery: Your battery must maintain a minimum voltage of 40 volts. If the voltage goes below 40 volts, the battery could become irrecoverably damaged and might no longer be able to accept a full charge.