[header] How to extend battery life in ios 9 [title] Identify apps that are battery hogs. [step] Open the settings app then locate the battery app, which is just below " touch id & passcode. " open the battery app to view detailed information about your battery. 
[substeps] View the battery usage heading to see a list of the apps you use. A percentage value is listed to the right of each app, denoting the proportion of battery each app used.