I m looking for an iPhone 4/4s case where you could simply snap on the battery when you need it, and when the phone is charged up, you take it off and put it away so the phone isn t bulky all the time. Or at least a power bank that hangs on the back of the phone and charges. I m looking for something at least 1900mAh and under $25.
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Is there an iPhone 4/4s case where you could snap on and attach an external battery?