galingula,
my apologies, i see that you're still new to the site. Try this cab. Its called no push internet. The stock sprint rom is setup so that your phone downloads stocks, email, and a lot of other junk constantly and it drains your battery life. No push disables that, and will only update stocks, email, etc when you push the send/receive or update button. it will greatly increase your battery life. Also if you have email snyc to your phone make sure you set it send receive like every 1-2 hours. the more you send receive the more you drain your battery.