Battery issues after update?

[jtjohns]

I apologize if this has been covered, but I cant seem to fix this problem. Every since the sprint update about a month ago, my phone battery will not last more than a couple hours with moderate use. Apps continue to open themselves in the background despite using "Startup Auditor" and "ATK". What can I do to solve this issue? Before the update, I could atleast go a full day without recharging. As of now, a full battery dies over night with absolutely no use. Would flashing a new ROM help this by eliminating some of the pointless features on the phone?