How powerful your power bank is ?

There is a long time and a lot of time, a lot of businesses just say how much capacity of your power bank for iphone 6 or samsung galaxy s4, but we do not regard itself simply a concept popularized best say that you can charge how many times,  it is easy to understand otherwise it is difficult to trust the quality.

it is really hard for people to understand how much capacity such as 2600mAh, 5600mAh, 10400mAh,  dont you think so ? i really hope someday merchandise can put the description easier for people now to understand, you can say 1 power bank can charge 5-6 for your iphone 6, or 1 battery charger can charge 3-4 times for our samsung galaxy s4....that will make life easier to understand, do you agree with my points ?

Thanks for your attention and let me know what do you think.