My new iPhone 4s Battery dies quickly?

I got my white iPhone 4s a few days ago and I feel like the battery runs out pretty quickly… I turn the brightness down and completely shut down all off the applications at the bottom, but I feel like it still doesn't last very long… It'll go from 100 to 65 within a few hours… My sister has the black one and she says hers doesn't die too quickly. Any suggestions?

That's what happened with mine
Turn your brightness down because it kills your battery. It actually lasts so much longer x

Buy a new battery.

Or follow this:
http://www.idownloadblog.com/2010/06/29/10-ways-to-save-your-iphone-4-battery-life/

Turn off Siri, turn off as much notifications and location services as you can. Finally delete email accounts that you don't use and wait for updates.

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