Last longer with a High Capacity External Laptop Battery Pack
The High Capacity External Laptop Battery Pack Model PowerPack 130 by BatteryGeek is a must have gadget for anyone spending a lot of time using their laptop or tablet PC on battery power.
It lasts up to 3 times longer than a normal laptop battery. Just connect the laptop using one of the 9 supplied connectors and the laptop thinks it is connected to a normal power supply. The laptop runs on the external power and recharges its internal battery if needed. mobile guru jkOnTheRun has a lot of good things to say about it.