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Which External Battery Pack Charger is Better?

Last response: in Cell Phones & Smartphones
March 2, 2014 6:07:24 AM

I've been looking around for a battery pack with high capacity, but a reasonable price, and I have come across two different ones with basically the same capacity (the extra 600 mAh doesn't make a difference to me) at the same price. THese are both about 15000 mAh at $50, the best deal I could find in terms of mAh per $. The difference in them I think comes in the actual ports and their voltage, which I don't quite understand the advantages/disadvantages of. COuld someone explain?
This one:
Or this one:
I am going to be using it primarily to charge my Nexus 5 and other smartphones, as well as maybe a tablet here and there.

Best solution

March 2, 2014 9:48:53 AM

second one