Actually you don’t want to use other cases or want it in reverse. The reason is because a regular battery case or one of those usb battery things, when plugged in, makes your phone think it’s on AC charger and all kinds of processes run that don’t run on battery. A smart battery case (Apple) uses the battery in the case first abs the phone knows the battery case is connected and not on an ac charger.I want it in reverse—the case should be the ‘reserve’
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I had the issue on one I bought last January. It’s been randomly not charging the phone for the past few months. Just made an appointment with Apple this morning and was in and out in 20 minutes.