I always have WiFi and GPS on and use bluetooth occasionally throughout the day. Once I found out it was YouMail killing my battery and uninstalled it, I get 20-24 hours on one charge with heavy use. I also have my exchange account set up to receive mail as it arrives. Did you check your awake time? My guess would be that its either at or real close to 100%. Since getting rid of YouMail, mine stays right around 16%.