Battery pack calculator Capacity C rating ampere To get the current in output of several batteries in parallel you have to sum the current of each branch Caution do not confuse Ah and A Ampere A is the unit for current Ampere hour Ah is a unit of energy or capacity like Wh Watt hour or kWh or joules The global capacity in Wh is the same for 2 batteries in serie or two batteries in parallel but when we speak in Ah or mAh it