At 2200mAh it has about sixty percent more capacity than the stock 1560mAh battery in the 5S

In the case of this one, even if I use seventy percent as the loss factor, it will still double the use time of your 5S, which is notoriously power hungry to begin with

You can perform any function with the phone in the case that you can with it outside of it

Right up there with added battery capacity is the protection that the case affords

Another feature I love is the MFi certification

One final note: there are no compromises in camera or screen access