All kinds of battery, portable charger, range from 1900 mAh - 12000 mAh.
Power bank knowledge base:
For all portable power banks, the power usage effeciency is not 100%, inside the power bank, the voltage is 3.7 V, there is a boost converter to boost voltage to 5.2v, it got a convert efficiency - about 80%.
The voltage of battery of digital devices is range from 3.6-4.2V, there is a step down circuit inside the devices, the power transfer efficiency is 60%-80% depends on the devices.
So, for any portable power bank, its power efficiency is about 80%*80% = 64%(depends on quality of power bank).
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