[Q] can anyone help me solve a battery issue?

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http://forum.xda-developers.com – I've got a stock S3 running nova launcher, but unrooted. i was typically getting around 14-20 hours battery life from a charge, with between 3-4.5 hours of screen-on. i think it dates from the jelly bean update, but recently my battery life has dropped significantly... i'm lucky to get 12 hours, and very lucky to get more than 2 hours of screen-on. i've been looking through many, many forum threads both here and elsewhere, but am getting really bewildered - i've installed betterbatterystats, CPU spy and Watchdog lite, but to be honest don't really know what i'm looking at/for. I've trie (HowTos)