From being on Stock everything!!!...i was having majoring battery problems after updating to 2.2...i have search, i did all the tricks and erything, still no use...So i finally installed Juice Defender and Battery Doctor (tracks percentage and charges the phone up really quick and lets you know if you got a full cycle charge or a normal charge) and every since I installed these 2 apps i went frm 5-6 Hrs Heavy use to 14-16 Hrs Heavy use!..which is greeeeeat for me. I still have twitter syncing, i use google talk so i cant take background data off..right now im on 9.5 hrs with 35% left..which will get me to 12-14hrs today. Like i said, im a heavy user, I tweet, Facebook (internet not the app) send alot of txts and google talk.