How to extend battery life of ASUS X54HR series

How to extend the battery life of ASUS X54HR series:

ASUS X54XI233HR-SL

 1 . Adjust the brightness of the LCD screen to the appropriate brightness.

 2. Adjust the volume to an appropriate level.

3. Remove the PC card device and the disk in the optical drive that are not in use.

4. Set the power management configuration.