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Review Summary
5V, 0.5A
5V, 0.5A
1600mAh(Li-Pol)
iPhone 4
Up to 360 hrs
Up to 6hrs on 3G
Up to 6 hrs on 3G
Up to 10.6 hrs on Wi-Fi
Up to 36 hrs
Up to 10.6 hrs
3.6 hrs
The MiLi Power Spring 4/4S is an extremely thin battery case designed to double the life of the iPhone 4 & 4S. With it's sleek form fitting design, it also protects the iPhone from scratches.