I'd fit this in my sig if I could I've answered it so often:
it depends what kind of user you are. I'm a very light user. I only surf websites/email, only use the GPS in the Car Dock, very rarely use videos/camera/camcorder. I only stream about an hour of video total in a whole month. I don't stream radio. I use up to 250 texts and 250 minutes of voice per month, and I'm almost always well under that. I can normally get at least a full 24 cycle from one charge. Heavy all day use is lower but still respectable, but I haven't really measured that yet I don't do it often unless I happen to be spending a day changing all my customizations and goofing around with videos and games.
Having established that, I'm also a minimalist. My screen brightness is set all the way down to the lowest setting 24/7 and I only turn it up when I'm outdoors in daylight. The auto-display mode is a battery drainer. I don't use the "nightsaver" battery mode, I set my custom mode to be at the same settings as "Max Battery Saver" mode all day and all night. I have about 5 widgets total, only 2 on the home screen.
Automation: zero. no mail syncing, calender syncing, weather updates, news updates. all that shit is set to
manual. I don't have very much sympathy for that "but it's a smartphone" crowd who are so lazy that can't click a couple of buttons a few times a day to check email or weather.
Just go through all your menus in settings, find anything that uses data automatically and set it to manual. Do the same for any Apps you have that might do stuff in the background automatically.
One other thing I do is whenever I'm not using my phone for data (voice and texting only) I use a power app to manually turn off data. My WiFi is
always turned off unless I'm using it. Same with my GPS, same with my autosync. I also use a lock disabler App to get rid of that annoying finger swipe every time I turn my screen back on. Haptic feeback is mostly disabled, as are phone animations.
This phone has a great battery, most of the people with problems that are NOT a bad battery are not using the settings I just told you about. Or they refuse to. feel free to raise/lower settings mentioned above to tailor for your own use.