Without fail, the battery on our laptops – notebooks or netbooks, always stop working and run our of juice at the most inconvenient time – in the middle of that rush report or when you are on a flight and watching a DVD movie
Laptop screens take up significant amount of power and we usually don’t require maximum brightness, so check your system and decrease the screen brightness it to a comfortable point.
Stop your wireless signal when you aren’t using it - After turning off your Laptop, right click on your WiFi control signal and be sure it is off to save a considerable quantity of battery power
Check your power plans - Windows XP has several predetermined power plans to control settings like how rapidly your laptop turns off and when your screen saver boots in. You can change your laptop power scheme by choosing Control Panel, then choose Power Options. For maximum battery life from the “Maximum Battery” option from the "Power scheme" and decline the list. Other good choices might be "Low Power Mode" and Portable /Laptop – they may not conserve as much power as Max Battery, but they still help. After choosing the power scheme, click Ok to finish the process.