Update the Qik app
Download the latest version of ‘Qik’ application from the market. The older versions of this video application prevented your cell phone from going to sleep due to continuous ping, draining your battery a lot. The latest version of this app was reported to improve standby time from 20 hours to 3 days!
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Turn off Auto-Sync
The ‘Auto-sync’ option can be find in ‘Accounts & Sync” settings in your HTC Evo 4G and you better turn it on only when you need it. Otherwise, keep it turned off for battery storage.
Disable Wifi and 3G
Obviously you are not using Wifi and 3G in your cell phone all the time. It is better to shut these options from ‘Wireless & Networks’ settings when you don’t wish to be connected to the internet.
Use dark wallpaper3
Try to use dark coloured wallpapers on your home screen, as they are energy efficient.
This app can be effectively used to close out any of the running app on your cell phone. Applications not properly closed keep on using your cell phone battery. Advanced Task Killer can be downloaded from Play Store and it is totally free!
Battery Status Pro app
Battery Status Pro application enables you to view the breakdown of your remaining battery of your cell phone, telling you the exact standby time, talktime, internet use etc.
Turn off social networks
Keeping logged in to social networking websites and apps is another factor affecting the battery life of your HTC Evo 4G. Turn off these apps and only sign in when needed.
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Turn off Home screen
Make sure to turn off the home screen by pressing the sleep button every time you put your cell phone in your pocket or purse. All of these pointers will contribute to improve your battery time and you will see a significant difference.