Can't you achieve the same effect by buying a case with a built-in battery? Admittedly you would have to remove the case in order to use the lightning port for syncing, but I suspect most people do that rarely, if at all, anyway.
I tether quite a lot (where I live usable free wifi is practically impossible to come by, where as LTE is everywhere). To prevent the phone battery going flat after an hour I tether over USB.
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Can't you achieve the same effect by buying a case with a built-in battery? Admittedly you would have to remove the case in order to use the lightning port for syncing, but I suspect most people do that rarely, if at all, anyway.
I tether quite a lot (where I live usable free wifi is practically impossible to come by, where as LTE is everywhere). To prevent the phone battery going flat after an hour I tether over USB.