- First rule is to be realistic. You cannot leave your phone standing on the table and not using it for two days just to get that much battery life out of it. So don't withstand yourself from using your phone.
- The display is the number one battery consumer. The longer you keep it on the more battery it consumes. There're some easy solutions here. You can use the 'auto' mode for the brightness or simply set it as low as it alows you to still see the content on the screen. Also avoid Live Wallpapers. They are nothing but RAM eating apps that run in the background and eat up minutes of your battery's life.
- Avoid syncing. That's one side of the everyday life that eats up a lot of your battery. Trying to always be updated to all the things your favorite move star does or having your facebook widget always loading on the homescreen is maybe that the best thing to do if you want your battery to last more. Try disabling syncing. See how it works for you. I'm sure you won't miss anything and you'l live to see another day. You can disable this into Accounts and Sync menu > Auto-sync
- Avoid widgets. This is another example of a battery draining app that simply doesn't have a very clear role. Aside from eating a lot of RAM memory and keeping an extra app alive and working in the background, again eating the battery, its not much of a thing to use widgets after all.
- Watch out for dangerous applications. Manage your installed apps with great care. They are one of your biggest enemy when it comes to battery life. Here's why. A lot of apps are designed to collect personal data and information and then send them back to their servers. That's how your data connection is being kept alive and if you didn't know, data transfer if one of the 2 biggest battery consumers for a phone. Also apps are sometimes running in the background even if you are not using them. You can install apps to monitor activity on your phone such as: 'Watchdog' or 'Juice Defender' (search them on Google Play).
- Wi-Fi settings. Go to Setting>Wireless>WIFI> Menu key>Advanced>WIFI Sleep Policy and set this to 'Always'.
- !!! Airplane Mode Trick. This one is really interesting. You know how your device always searches for signal in order to provide the best signal possible. Especially when you are travelling, your phone will always switch from a signal tower to another as the signal fades away. But in some cases, when you get home, the phone is still connected to a farther signal tower that can still provide good signal, while there's another tower closer to your home that can provide better signal. What you need to do here is to toggle Airplane Mode on and off so that when the phone searches for signal again it will connect to the closest tower. The benefit of that is, the closest the signal is to the phone, the less power it is required from the battery. This includes data transfers and cell standby.
- Location. You probably don't need to have location turned on all the time, because mostly this feature is used by Facebook, Twitter etc. So you can go to Settings > Location and turn it off. Anyways when you need to use an app that requires location you will be prompted with a message to turn it on, so it's fine.
- Manage the Memory. You will need a rooted device for this, but apps such as Cache Cleaner NG and Cache Mate can clean up the cache. This can free up some memory for you and preserve battery.
- Batstat Widget: It is a very useful app that uses really low resources and shows you the % of charge, the Voltage and the phone's temperature.
- BetterBatteryStats(BBS): This paid app will give you exact figures about what's eating battery life: Processes, Running Services, Wakelocks etc.
- Battery Calibrator: You can use this app in case you are having misread battery stats. When the battery stats are not true and you have no clue what's your real battery this app will tell you.
- Watchdog: Use it to observe the RAM usage
- Process Monitor: It allows you to see running processes and kill them
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