Quoted:
Battery, battery, battery.
I have an iPhone 4 and an Evo too - the Evo battery is horrendous, can barely get through the day
gotta know which settings to tweak
here a post i put in another evo thread
as for the battery guys try these tips. Ever since i did i am getting over 15 hours of battery life with heavy usage
http://www.sprintusers.com/forum/showthread.php?t=209410&highlight=battery
Very Important Tweaks:
Battery Tips
Menu - Settings - Brightness - Sound & Display - Brightness "Set Brightness to about 30%" or automatic if you prefer that
Menu - Settings - Brightness - Sound & Display - Screen timeout "Set to 1 minute"
Menu - Settings - Wireless & Networks "GPS, 4G, HOTSPOT, & 3G TURN TO OFF" Turn on when needed
(I keep my 3G on but it does increase battery life even more when off. They make a widget for this.)
Open Settings / Accounts and Sync / Uncheck Auto Sync, this will take care of the following:
Menu - Settings - Accounts & Sync (Turn off what you don't use)
Weather is on but set to download every 3 hours (" Uncheck Sync Box")
News is off " Uncheck Sync Box"
Stocks is off " Uncheck Sync Box"
Google is off " Uncheck Sync Box"
Open Mail App - Menu - Settings - Set download frequency to "Once a day" Set peak time and off peak time to "Once a day" If needed more change it to that. You can always check it manually.
Open Fring App - Make sure you are signed out and logged off when closing. Also go to Menu/Settings, and uncheck Automatic Startup.
Open Sprint Zone App - Menu - Settings - Set Update Frequency "Use once a week or once a month"
Open News App - Menu - Settings - Set Update schedule to "Manual"
Open Stocks App - Menu - Settings - "Uncheck Auto-sync data box"
Open Talk App - Menu - Settings - "Uncheck Automatically sign in box" and make sure you sign out. Do not back out, SIGN OUT
(credit to Slick1020)
but the best thing i have done is order 2 extra batteries from ebay. I just keep an extra in my pocket for the days i am away from home for quite a while
For $10 you get 2 batteries and a wallcharger. they are off brand but for me give the same battery life as the stock