I am fed up with the lack of my 5S's electricity during my trip, so I decide to buy a power bank to solve this problem, I take interest in thee two products, one is 10400mAh, another is 10000mAh, but why the second one is more expensive, do you know the reason, I don't want to buy a fake, it may causes some safety problem, so I do hope get some advice.
The first power bank >>
The second one >>
The first power bank >>
The second one >>