[Galaxy Grand 2 General] coolvij:
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9. Live wallpapers, another feature that distinguishes Android, can also use up power like crazy--typically the ones that are very graphics/animation intensive, or the ones that also access the web for information like weather. Use static wallpapers instead, but if they're too boring, here's a list of some of my favorite live wallpapers that use minimal battery:

ARTware ATOMium

Blox

Digital Hive

Fading Lines

Light Grid

Mystic Halo

Retro Contours

SwampWater

10. Vibrate uses a lot of power. Do you really need your phone to ring and vibrate at the same time? Do you really need the haptic feedback when you're typing (especially if you're using Swype-style gesture typing)? Turn off vibrate.

11. GPS is another big power-sucker. For most location-based apps, using Google Location Services (based on the wifi hotspot's MAC address or by triangulating your nearest cell towers) is enough, since it generally locates you accurately within about 100 meters. Use GPS only if you need a more precise location, like if you're driving and using Navigation. Otherwise, turn off GPS by changing the setting to "Battery Saving."

12. You never know what kinds of processes the bloatware on your device might be responsible for, but they might be contributing to battery use as well. Go to Settings/Apps/All Apps, go through the list, and disable any bloatware apps that you don't need. Be cautious that you don't disable an important system app--if you aren't sure, just post a question in one of the AC Forums, and someone is bound to know.

13. Understand how Android utilizes RAM, and resist the urge to use task killers. To understand how things work, read this article by the esteemed Jerry Hildenbrand here, as well as this guide by Ambassador extraordinaire Golfdriver97. Apps that you kill manually will often restart on their own, which in itself takes a little bit of CPU and battery power--so if it's happening hundreds of times a day, it can become significant. The main reason to use a task killer is if there is some runaway process that you know is bogging the system down and won't shut down on its own. It might still restart on its own--if the cycle keeps happening, it's probably a problem with the app, which should be uninstalled or disabled.

14. Poor cell reception kills battery, because the radio is working overtime to try to establish the connection. If you know you're going to be in an area of poor reception for a while, consider turning on Airplane Mode to temporarily shut off your cell radio. You can get some idea of how much time you're spending in an area of poor signal by going to Settings/Battery, tapping Cell Standby (if it's there), and seeing if it says how much time without signal there was.

15. If none of the above tips are helping, then try wiping the cache partition, which is the portion of memory where Android stores a lot of temporary data. It's a little different from clearing the cache of individual apps, because the cache partition also stores a lot of temporary data used by the system. You need to access your device's recovery menu in order to wipe the cache partition, and this process varies with the device, so the best way to learn how to do it is to do a web search

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