The Batterylife indication in MS Windows is very unreliable. We have done actual tests with a stopwatch and than the Joybook can reach between 4 1/2 and 6 hours of Batterylife depending on the model and the settings used. Below components/programs put a big strain on the batterylife :

• Wireless Lan
• LCD Screen set at high brightness
• CD/DVD Burner
• Heavy use of programs like "Photoshop" or similar.

For increased batterylife above should be disabled or set at minimal use.  If you want to measure the maximum batterylife see above information and also disable powermanagement and the screensaver. Use a clock or stopwatch to measure the time untill the joybook rus out of power.  Don't use the Joybook during the test. Alternatively there are also special programs that can measure the batterlife like "batteryeater"  from  www.batteryeater.com . Use of these programs is of course at your own risk.