@juliank your power bank has the charge of 10.000mAh and works at 5V, it is capable of delivering 50Wh, if you replace it with one of 10.000mAh that works at 12V, it will deliver 120Wh.
The capacity is the same, but the second will charge your phone faster.
@juliank I am talking about the USB, my power bank for example, it can deliver energy at 5V 3A, or 12V 1.5A. It depends on what my phone is capable to receive.
@kennergf yes but the battery voltage for which the mAh are related to doesn't necessarily have anything to do with the voltage that's going out via USB.
Like they may be using 2,5V cells and running 4A or 10V cells and 1A to deliver 5V/2A power to USB.
@juliank those batteries are both 50Wh, the difference is, the first is connected in parallel for more power deliver, and the second is connected in serial for less power deliver, but they have the same number of sells and specification.
And unless you are buying a shady power bank they will be labelled appropriately.
@juliank@kennergf Yeh I'd missed your earlier point - you're right - without knowing the battery voltage, the mAh number is meaningless. Well most battery numbers are lies anyway, but still.
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