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 ==