Battery Life issues - open to suggestions

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http://forum.xda-developers.com – First, here's the constants: I keep wifi/BT/GPS on 100% of the time. This was true when battery life was good, and now that battery life is bad. Disabling these will improve battery life, but will not fix my problem. When the phone is sleeping overnight, I used to get 8-12% battery usage over about 8 hours. It was not uncommon to take the phone off the charger when I went to sleep, and wake up nearly 8 hours later with battery life in the low 90s. Now, battery life depletes at 30-50% over the same span. Android OS is the culprit, which simply means to me that some app is draining me whil (HowTos)