for heavy users additional battery must, these @ moment take form of outer case or spare charger battery of inherently inefficient because internal battery of iphone (about 1500mah) 3.7v, charged via 5v source. additional battery 3.7v , needs circuit "boost" voltage 5v iphone accept charge.
both booster circuit, 5v, , charging circuit, 4.2v, generate heat....wasting in short supply.
here's think people manufacture, replacement thicker normal 1 house additional battery, perhaps of identical amperage stock battery. 2 can joined inside case creating new thicker , heavier iphone doubling in battery capacity.
approach thinner , lighter slip on case of same capacity , yet more efficient electrically, there no wastage in form of heat during boosting , reducing of voltage charge.
think of if apple sell 3000ma version of iphone4 "power user", people accept thicker , heavier phone, did when buying accessory battery jacket, more efficient.
seen that?
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