Laptop vendor gave writer some tips to increase the battery life to maximum :

Charge your battery fully and then discharge it till the laptop shuts down by itself. You can do this 2-3 times before your journey. This gives your battery some exercise ( & exercise is always beneficial to health )

Decrease the monitor brightness. This gives you an extra 1 hour battery life

Defragment your hard disk from time to time so it will help your PC’s hard disk lower its power consumption.

Turn off useless programs running behind. Open your task manager to see the programs running

Remove or shut down �not used� externally plugged devices like USB devises, printer, ipod, Wifi etc

Use it in a cooler environment.

Clean your battery contacts regularly to ensure the best efficiency. Use alcohol swab or a pencil eraser to clean the rust if there are any.

If you are not using your laptop for a very long time, you can remove the battery. Even in shutdown mode,the battery keeps discharging a little.

Go for Lithium-Ion batteries because they offer longer battery lives.

If you travel frequently, keep an extra battery ready for emergency use.

You can use the Hibernation mode to shut down your PC very quickly. This mode also allows your computer to turn quickly.

Source: scriptdebate.com