Question

How many volts is 20000mAh?

Answer 1

So if the energy of the battery is 74 wh then the 20000mAh rating corresponds to a test voltage of 3.7 V. Assuming the unit is as efficient in producing 12 V as 3.7 volts then the mAh rating at 12 V would be 20000 * 3.7/12 = 6167 mAh.