I bought a "just wireless portable battery pack". How do I know it won't fry my Iphone 4?

I Recently bought a  just wireless brand rechargeable battery pack. How do I know whether or not it will fry my Iphone 4?

gregfromolive branch wrote:
I Recently bought a  just wireless brand rechargeable battery pack. How do I know whether or not it will fry my Iphone 4?
If it has a Made for iPhone logo, similar to this, it is okay.

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