@vansterdam we had a discussion about those cases a year ago in the iPhone 4 thread.
The mophie juice ones arent bad. I'd say it charges at least 50% of your battery? Someone bought the eBay and deal extreme ones and had a bad experience lol the mophie and blackbox ones are pretty good but they leak battery even when you don't use them
I personally prefer the juice pack plus over the marketplace because I hate how chunky it feels. I stopped using the case after 2 weeks lol
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