App allows you to track the battery life of a friend or family member's iPhone or iPad
The app isn't free, however, and requires that you part with 99 cents. And guess what! If family and friends agree to follow your iPhone or iPad, the app also will alert them about your current battery level. This way, your friends will know if you're being a total ass by not responding to them, or if it is merely a case of a dead battery. Plenty of misunderstandings on both sides can be avoided by buying Battery Share.
And yes, there is more. The app also allows you to make VoIP calls to the iPhones (sorry Phil) you are tracking. One thing to keep in mind. Battery Share requires that the user is rocking iOS 9.1 or later. If you've fallen behind and haven't updated your iOS device in some time, better do so now if you plan on purchasing Battery Share. After all, the battery life you save might be your own.
source: BatteryShare (iOS) via RedmondPie