My iphone battery keeps dying and I'm not using it?

It is connected to the Wi-Fi in my house, so not 3G. It will be 100% before I go to bed, then by the time I wake up in the morning the battery has died.

The battery is draining when I'm not using it?

Today I charged it to 95%, was home for a couple of hours, didn't use it and now it is at 4%?!

What is wrong with it?
I don't have any new apps or anything, it's never done this before!

Apple sent out the ios 6.1.2 update last night. It's supposed to improve battery drainage. I've installed it on my iphone 5 and it's so much better. Install this and try it for a few days.

Hope this helps

Your apps may still be open, double tap the home screen when your on it, hold down on an app that appears at the bottom and when they are wobbling shut click the close button, close any you're not using. Also you may have data roaming, location services and Bluetooth etc. On unnecessarily.

Install ios 6.1.2

Its time is coming, let it die, stop letting it suffer more in this cruel world.
"May its soul rest in peace."

Some update from apple makes it drain more battery

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