This app was removed from the App Store.
iOS iPhone Utilities
Unlike the usual battery apps, YourBattery calculates the remaining lasting time of your battery according to your use.
Therefore YourBattery helps you to determine whether you can use your phone until you are a home again.
The only thing you have to do is start YourBattery several times during the day and the rest will be done by YourBattery. It will store the battery status and the date at every start of the app and use this information to calculate the remaining usage time of your loved device.