How to calculate the power bank rated energy?If it doesn't label the rated energy WH( watt hour) on the power bank,you can use below formula to make a simple conversion:

      1.power bank nominal voltage (V) and the nominal capacity (Ah),then the rated energy WH= (voltage)V x (nominal capacity) Ah

      2.If power bank is only labeled with (mAh), which can be divided by 1000 to get the nominal capacity (Ah), and then multiplied by the nominal voltage, the rated energy can be calculated