Will a 1a usb port break an iphone 5 battery?

I'm buying a rechargeable battery pack that has 2 usb ports 1 of them is a 1a port and the other is a 2a port. I would just like to know if either one of these ports would damage an iphone 5 battery or so on.
the rechargeable battery pack i'm buying from amazon can be found here http://www.amazon.com/...00BQ5KHJW/

Please Help

Added (1). Ok now i now that the 1a is what i'm supposed to use but will the 2a damage the phone at all

1A is the one you're supposed to use.

The 2A is for tablets. Don't use that for your iPhone.

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