olderthaniam

I don't see anybody else mentioning this here and for a review this is a glaring omission, but there is a fundamental difference from the way that the apple battery case operates and how the other cases in this segment function: if both batteries are fully charged, the Apple Smart Battery Case will deplete it's battery before allowing the phone to deplete it's internal battery.  This puts the charge cycles on the external battery, which is cheaper and easier to replace than the internal battery.  This saves you money and keeps your $600+ device younger, longer.  Other options in this segment are designed to recharge your internal battery once it is depleted, adding additional charge cycles to your usage pattern.