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PowerBank capacity

Why has my PowerBank lower capacity then the nominal value?

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PowerBank capacity is necessary to measure at voltage of one cell (3V).

 

For example power bank with capacity 13.6Ah made by 3V cells has 40.8Wh of energy (13.6Ah x 3V).

If we charge / discharge at 5.1V:  Capacity = 8Ah (40.8Wh / 5.1V)

If we charge / discharge at 12.8V:  Capacity = 3.18Ah (40.8Wh / 12.8V)
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