I want to know about the battery usage percentage for each apps and available battery power in the android.
Settings » About phone » Battery use
The following ways are used to save battery life in Android:
•Disable 3G connectivity and tell the device to only use 2G networks.
•Put your phone on standby mode when you are not using it.
•Set your screen timeout to the shortest length possible.
•Use the Power Control widget.
•Reduce the brightness of your display.
•Put the device in “Airplane Mode” while on an airline flight.
•When traveling, take your charger as well as a USB cable with you and get a car charger.
•Set a reasonable update frequency for apps.
•Turn off the phone vibration function.
•Turn off the GPS.
•Turn off the Bluetooth feature when not needed.
•Turn off the wireless feature when not needed or set a Wi-Fi timeout.
•Switch off auto-sync.
•Do not leave applications running when you don’t need them.
•Turn off “Background data” usage.
•Don’t drain the battery.