48v6a smart pulse charger rated voltage is 48V, rated current is 6 amps, when 48v6a smart pulse charger to charge the battery, because the two are charged in parallel, so the rated voltage of the battery and the charger should be the same, the rated current of the battery is greater than the rated current of the charger, at about 12 amps. So you can charge a 48v12a battery.