There are a number of tips that can increase the battery life on your iPhone or iPad, shutting down multitasking apps is not one of them as it will do nothing to increase the battery life on your iPhone.
These was recently confirmed by Apple’s SVP of Software, Craig Federighi who replied to an email of an iPhone user, you can see the email below.
Shutting down all of your apps on a regular basis could actually reduce the battery life on your iPhone, as it uses power when you shut each application down.
Once he apps are put in the background their are either not running or frozen, which means that they are not using any of your battery power.
We have some handy tips to help your improve iPhone battery life, these tips will work on the iPhone and iPod Touch and all of them work on iOS 9 and above.
Apple has now released the new 9.7 inch iPad Pro and we compare the difference between the iPad Air 2 vs iPad Pro in our handy guide.
Source 9 to 5 Mac