How do i trouble shoot poor battery life?

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http://androidforums.com – Hello everyone. I have had what I consider good battery life foe the duration of my SGN. I have had the extended battery for about 6 months and been through several ROMs over that time span. Over the past 1-2 weeks my battery really won't make it all day with out a charge. Can someone point me to steps to trouble shoot if I need a new battery or if there is something else draining my battery? I don't keep great track of the things that I have updated on my phone and I don't keep good records of when I installed this or that app. I'd there was one that I installed and I started to get (General)