get a new battery... yours is drained.

battery life can be influenced by a lot of things, first thing you should do is tune down your screen brightness. then check the manual for the first charge procedure, it usually involves fully chargin the battery. you can also have a look into installed apps as some run services which drain the battery. as last resort you can install an app like juicedefender to turn off internet and other power drains if you're not using them.

You can train your battery to have a longer life. If your battery dies quickly it is because it is used to being charged too often.

Let your battery die (Completely) leave your phone off for as long as you can handle (1 hour should also do the trick). If you use your phone a lot or cannot stand having it off for too long at least 5 minutes should also work.

Then charge it fully to 100%

And that is it. You must continue this for a while. Remember not to charge your phone until it is absolutely necessary. I did this with my phone and it got to the point where my phone and I were as one. It charged as I got ready to sleep and it would last all through the next day. On the weekends I used it less and it would last from Saturday morning to Sunday night. It didn't even die anymore.== Heading text ==