Until now there was no public API for developers to retrieve battery data such as cycles, battery health, or charger information such as actual charging current and whether or not the device is actually charging. The data was actually available, but was not officially made available by Apple. Many apps (including my own Battery Health which was removed from the App Store by Apple a while ago) took advantage of this information. There are still several apps on the App Store that utilize it. Unfortunately, with iOS 10 Apple has decided to completely hide this information from the end-users (even though this info has been available on iOS devices since pretty much day 1) and with iOS 10 it is no longer available to anyone. Just an FYI. Note: I have not tested this with iBackupBot and similar tethered solutions that require a PC/Mac.