The link doesn't work, probably because it's now no longer available, but it's a terrific capacity. I assume this example is one of the more recent versions?
tinyurl.com/ycsbohym
The ones I mentioned (especially the very compact Anker product) will charge a phone several times though and have a maximum amp of 2.1. iPhones seem to have much smaller batteries than Android phones (I'm thinking of the earlier models), so friends have been pleased to acquire such power banks, in particular one who does a lot of cycling in more remote areas.
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