Is 2600mAh power bank good enough for iPhone 4?

Now I'm thinking about this one: http://www.amazon.com/...B00MP6M79E

But I'm not sure how many times can a 2600mAh power recharge my iPhone 4. Anyone got answers?

Battery capacity is 1420mAh or so, meaning that charger will get you not quite 2 charges.

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