You can greatly improve battery life of your Android device by using JuiceDefender app. This application intelligently manages various battery sensitive components and it automatically disables some of your device functions at the times you are not using them.
Simply install the app, choose a profile from balanced, aggressive or extreme. All profiles works differently like ‘Extreme’ will completely disable connectivity by default, it saves more battery and allows you to quickly enable connection by pulling down the notification section. Other than this there are more features and all are explained with in the app screens.