Support Battery Life Help

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http://androidforums.com – I got my phone nine months or so ago, and the battery life started out fine. I could go eight hours or so of constant use, but now it hardly works. I'm lucky if my phone will stay on for thirty minutes. Once it hits fifty percent, my phone immediately shuts off. I've tried turning off my data, keeping the brightness down, and anything else that worked on my previous Android. So far, nothing has worked and the battery life seems to be decreasing more and more. Does anyone have anything that could help? (General)