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How to find out real capacity for power bank?Why battery capacity is 10000mah,the rated,real capacity is 6000mah?

Why battery capacity is 10000mah,the rated, real capacity is 6000mah? Is it the fake capacity?

Try to understand this from listed two answers below;
1.Conservation of Energy
The battery voltage is 3.7v,the mobile devices charging voltage over 3.7v,in this way, power bank need to raise the battery voltage3.7v exceed the mobile devices voltage for charging.
For example, aimtorp model A-WPB04 , the battery charger has to boost voltage to 5v to charge the mobile as the battery voltage in cell is 4.2v.


Based on conservation of energy, when the battery capacity 10000mah, it normal power is 10000mah*3.7v=37000mwh, but it output rated capacity is 3.7v/5v*10000mah=7400mah due to boosted circuit with 5v output.

2.Energy Loss during Work
The power bank cannot output 100% power because of the energy consumption during the process of voltage increasing, and its average exchange rate is 80%, therefore, the real rated capacity is about 6000mah. 
Also, the exchange rate is related to the output current. In general, the exchange rate is higher with 1A than 2A. 

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