If your phone is stand by during the charging, the battery case will stop charging automatically when the case recognize your phone is in full power. And you will need to turn it on again for next charge.
But, if you need to use the phone during the charging, the battery case will continue charging even if your phone shows 100% electricity until the case is empty. So you will need to hold up the power button for 3 seconds to turn off the case manually.
If you have more concerns, please just feel free to contact us.