I found a super stuff, iphone backup battery which is also can charge for Blackberry, Nokia, Samsong etc. It is a very power for iphone external battery. Because it use 18650 Li-ion battery, you can change that battery. The battery capacity is 2200 mah, it means double of iphone internal battery. What? It is still not big enough. Ok, you can buy another 18650 batteryjust couple bucks. You can see and change the battery, so they can not cheat you on the battery capacity.
Anyway, check this website, you will find what you want:
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