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Portable Power Packs Give Tired iPhone Batteries a Jolt3G is a real drain on a smartphone's battery -- that's something iPhone 3G owners know all too well. Unlike most other phones, however, the iPhone does not let the user change out a dead battery for an on-the-go pick-me-up. For that, users will have to look to look into a rechargeable portable battery pack. Reviewer Chris Maxcer tried out two such products.