Unlike the old standart phones, Android phones can eat a lot of battery resources due to these powerful HD displays, Dual-core/Quad-core processors, WiFi, GPS and so on and on.
Therefore Android users need to be a bit careful on what features they leave on and how to manage those features. If you are unable to charge your Android device often, this post will give you some handy tips on how to survive longer until it's time to charge.

1. Reduce screen brightness

One of the biggest causes for battery drain could be the high brightness. By reducing the screen brightness a bit, your screen uses up less battery energy.

2. Stop WiFi if not in use

Disable your Wi-Fi connection if you are not going to use it. If you are in a bus or simply walking past different buildings and homes with Wi-Fi hotspots, your phone constantly is trying to scan for new connections. I recommend you only turn on your Wi-Fi connection when you are going to use it. It takes less than 10 seconds to turn it on/off by simply dragging down the status bar and pressing the Wi-Fi button.
You can also just set WiFi to sleep whenever you lock your phone and have it automatically turn on once your phone wakes up. There is an option for that in your WiFi settings menu.

3. Don't use Live Wallpapers

Live Wallpapers are cool, it's neat to see moving things on your homescreen but some can be a huge battery drain. Switching to a simple image wallpaper will surely conserve some energy.

4. Switch from 3G to 2G

3G gives great data speed but it can also be a battery drainer. If you are not much into internet browsing or you don't mind about the speed, you may switch to 2G networks from your mobile data settings (this varies on each Android version). I'm pretty sure you may have spotted that type of option somewhere in your network settings.

5. Turn off location services

GPS is very useful if you are on foreign places but it also can drain battery. If you are not going to be using it, you may turn it off. GPS usually comes turned on whenever you start an Android device for the first time so you could try and check if yours is turned on.
You can turn it off by going to Settings -> Location services (the name may vary by each device/android version) and turn off any options you see there enabled.

6. Disable auto-sync

Having your device receiving notifications from the web every minutes/hours can also be a battery drain. Receiving notifications such as whenever you have received an e-mail from somebody is what the auto-sync feature does.
You can turn it off by going to Settings -> Accounts and sync settings.

7. Use less widgets

Using a lot of widgets on your homescreen especially widgets such as for the weather, use up RAM and can drain battery. If there are particular widgets you don't need, there is no need to keep them as all they would do is drain your battery.

8. Use inverted mode when browsing

Using inverted mode when browsing the web could also save some battery life. Basically in inverted mode you look at the pages in a black and white color. With nowadays' modern technology, manufacturers create HD displays, rich of colors which ofcourse, consume energy. So in this case the inverted mode can be quite helpful in battery saving.
If you don't know how to turn it on, try reading this post.

9. Disable Bluetooth if not in use

Disable your Bluetooth if you aren't going to use it as it will constantly try to scan for new devices just like how WiFi does.
You can disable bluetooth from your Bluetooth settings which are found in the Settings menu or by using the shortcut key on your notification screen (varies by device).

10. Check the battery usage screen.

Android has a built-in battery usage screen which can be found in your Settings. It's usually named Battery and in there you can see which part uses the most battery.
It is also a good idea to check and see if you have useless apps running in the background that use up RAM. 

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