Sprint Phone- Batteries? Why did it die already?

What phone do you have? Some phones (razr) are known for poor battery life. Are you in a good coverage area? If not your phone is constantly searching for signal and that kills your battery life. Another thing is charging your battery overnight, the lithium ions inside swell and burst when they are overcharged, when they burst they can no longer hold a charge and your battery dies! You can usually tell by feeling your battery if it is swollen, it is no good. you should only charge your battery for 4 hrs or until it is fully charged. That will help improve your battery's charge. If you are having problems and you have insurance on your phone just stop by your local sprint repair center and they will give you a replacement battery at no charge.