Many android apps won't completely close and will keep consuming battery. Most only take up a small amount, but they add up. If you get 10 or 12 apps that you have opened and are still running in the background, go to activity monitor and close them. Alternately you could just reboot your phone periodically, even if the phone is running well, which it probably will be, this will close out all apps and will help increase battery life. :
Posted via CB10