Get Battery Doubler from here
Simply download the application and install it to the laptop then it will show on the taskbar. Hence, click on the Battery Doubler icon in the taskbar. Choose Main Menu and it will open the Main Menu of the application.
By default, Turbo charge mode is disabled so you can enable it when you need to recharge the battery quickly. It recharge the battery more faster than normal.
You can also calibrate the battery using Battery Doubler. Click wizards tab on the Main Menu and then click on Recalibrate Battery.
In the Autonomy Tab, you can choose Maximum autonomy option which will lower CPU usage when possible.
In addition to this configurations, Options Tab can be chosen to change Advanced configurations to achieve a lot of autonomy, Battery Doubler can make your battery consumes almost 8 hours if your computer supports ACPI or better. There you can change four selections
Lower hard disk spin (up to 60% less speed)
Cut down screen power (up to 75% less luminosity)
Low down CD/DVD usage (40% slower)
Reduce processor speed (50% slower)