Why does my iPhone 5 drain battery even when I don't use it?

My battery keep running out even when I don't use it. I tried to turn off location services and brightness and stuff but doesn't really help. What should I do?

Email me. It happens to my friend. Its the network settings.

You need to be more clear about how long it takes to run out.
if its like a day, that's what batteries do, but if its like 20 minutes after being charged on full you probably have a faulty battery.

It's normal for a smartphone battery to last only a day or two on a charge, even if you aren't using it. That's because it's still frequently connecting to the network to check for updates etc., whether you're doing anything with it or not.

The link below has some tips.

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