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by janardanyri 5014 days ago
The iPhone's battery takes up a gargantuan amount of its internal space already. Multiplying the battery size by 7 would end up doubling or tripling the device size easily. See the iFixit teardown of the 4: http://www.ifixit.com/Teardown/iPhone-4-Teardown/3130/1

It's truly just an incredibly hard problem to solve.