According to David Pogue, keeping a bunch of apps suspended in your multitasking queue is actually sucking up you device's battery life. He suggested four ways to making your battery last long
1. Push e-mail
If you turn off the "Push" feature, and set it to Manually instead (in Settings->Mail, Contacts, Calendars->Fetch New Data), then your iPhone checks for e-mail only when you actually open the e-mail app. Your battery goes a lot farther.
2. GPS checks
In Settings ->General->Location Services, you’ll see a list of all the apps on your phone that are using your phone’s location feature to know where you are. Disable GPS is another method to making your battery survive longer.
3. Notifications
In Settings -> Notifications, you see a list of apps that are allowed to display pop-up notifications. Turn off the ones which you don't really need.
4. Background apps
Applications running in the background can still use battery. Kill them!
Four Ways to Make Your Battery Last Longer [via]
1. Push e-mail
If you turn off the "Push" feature, and set it to Manually instead (in Settings->Mail, Contacts, Calendars->Fetch New Data), then your iPhone checks for e-mail only when you actually open the e-mail app. Your battery goes a lot farther.
2. GPS checks
In Settings ->General->Location Services, you’ll see a list of all the apps on your phone that are using your phone’s location feature to know where you are. Disable GPS is another method to making your battery survive longer.
3. Notifications
In Settings -> Notifications, you see a list of apps that are allowed to display pop-up notifications. Turn off the ones which you don't really need.
4. Background apps
Applications running in the background can still use battery. Kill them!
Four Ways to Make Your Battery Last Longer [via]