Saturday, 8 November 2014

batteries - mAh and Wh ratings not matching with voltage of device


I was under the impression that
Wh = Ah * V


I have a 20000mAh battery charging device for my phone but am confused about the information provided by it on the side.


It claims to have a 5V output (3.1A max), and a capacity of "20000mAh/74Wh". But following the above equation, 100Wh = 20Ah * 5V. Where does this discrepancy come from?




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