You can still charge the case without removing the phone.
Iphone battery case with lightning connector.
Plug the other end of the cable into an apple usb power adapter then plug the adapter into a power outlet.
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The case also isn t charged using the lightning connector but instead requires a micro usb cable thankfully there is one included.
With your iphone in your case plug the lightning to usb cable that came with your iphone into the lightning connector on the case.
For the fastest charging use an apple usb c power adapter that provides 18 or more watts of power.