iPhone 4 Battery drain all of sudden

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Starting today my phone was at 80% right before bed. I wake up at 7 and my phone is DEAD. like no battery whatsoever an my phone has never done that before nor did I let it die ever, in the two weeks I've had it.
I didn't change anything except changing my email push to sync no limits. Which I have switched back and have done 2 hard resets. I've also tried syncing my phone with my computer.

I've turned off all spotlight stuff, to turning down the brightness. And closed out of all background apps.

Please tell me anything that will take this problem away.

 

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My phone is not jailbroken. But I recently downloaded "hot app deals" and when I took off notifications it seemed to do the trick