QuickerTek has created an external battery for all MacBook Pros. The US$299.95 EyeBattery purportedly adds up to four extra hours of battery power to the MacBook Pro.
There’s a model designed for MagSafe 1 and another for Magsafe 2 power connector laptops. Like the rest of QuickerTek’s mobile power product line, the new EyeBattery also charges the internal MacBook battery while it powers the laptop. For more info go to http://www.quickertek.com/batteries.html .