Find out what’s actually eating your battery
Navigate to Settings > Battery to see an organised breakdown of what’s consuming your phone’s battery. Applications and features will display in a descending list of battery hogs. If you see an application you barely use or a feature you never use, you’ll want to uninstall the app or turn off the feature.
Reduce email, Twitter, and Facebook polling
Set your various messaging apps to “manual” for the polling or refresh frequency, just as a test, and you’ll instantly extend your device’s battery life by a significant amount. Once you see what a difference that makes, try re-enabling just the most important ones, and possibly reducing their polling frequency in the process.
Turn unnecessary hardware radios off
It’s great that today’s phones have LTE, NFC, GPS, Wi-Fi, and Bluetooth, but do you really need all five activated 24 hours per day? Android keeps location-based apps resident in the background, and the constant drain on your battery will become noticeable, fast. If your phone has a power control widget, you can use it to quickly turn on/off GPS (the largest power drain), NFC, Wi-Fi, Bluetooth, and LTE. On stock Android, swipe down to bring up the Notification bar, and then tap the icon on the top right corner.
Trim apps running in the background
From Settings > Apps, swipe to the left; you’ll see a list of apps that are currently running. Tap on each one to see what they’re for; you can stop any apps that you don’t need running in the background all of the time.
Turn down the brightness and turn off Automatic Brightness
It’s probably obvious at this point, but you’ll be surprised by how much this one alone helps to improve battery life.
Update your apps
Applications often get updated to use less battery power, so you should make sure your apps are up to date. Even if you configured the phone for automatic updates, some apps still require that you manually install updates. Check for app updates in Google Play by hitting the menu key and going to My Apps.
Keep an eye on signal strength
If you’re in an area with poor cellular coverage, the phone will work harder to latch onto a strong-enough signal. This has an adverse effect on battery life. There’s not much you can do about this one, but keep in mind that this could be the culprit behind a seemingly weak battery; it’s worth popping the phone into Airplane mode if you don’t need data or voice calls.
Sources: pgmag.com; buymondo.co.za