Battery drain since JB update?

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http://forums.androidcentral.com – I know most JB users have this problem but everyone seems to have an app or exchange draining most of the battery life. In my case it says it's the screen. I always have the brightness set to the lowest or in auto. It used to last 1 day without use and 9 hrs with use. Now it lasts less than 10 hours without use and less than 4 hours with constant use. Screens (with almost no use since the last full charge) Is there anything else apart from disabling exchange I can do? If not, I guess I'll try doing a factory or hard reset. (HowTos)