₦airaland Forum

battery life depends what you running, battery capacity and volt. battery energy mainly spent on display brightness,  so most netbooks battery life perform better than the laptop. usually 6-cell battery 2-3 hours, 9-cell battery 3.5-4 hours, 12-cell battery up to 6 hours.
Best way is looking a high capacity battery even a external battery. or get more batteries.

5-year battery experience with my
http://www.battery4us.com/

You can get the  HP f4809a battery for your xe4500 laptop hrer:
http://www.battery4us.com/hp-notebook-batteries/f4809a.htm