Was curious if anyone has used one of these:
http://www.versatile-studios.com/store/#/versa-battery-lithium-polymer-battery-pack
Looks like a better shape for travel compared to the hypermac, it is also a good amount cheaper. They have them on ebay as well for $350 shipped.
190 Watt-Hour Advanced Lithium-Polymer Battery Pack with modified Magsafe power cable to power Apple MacBook Pro 15" and 17"
Rechargeable, super high-capacity, advanced Lithium-Ion Polymer Battery Technology.
http://www.versatile-studios.com/store/#/versa-battery-lithium-polymer-battery-pack
Looks like a better shape for travel compared to the hypermac, it is also a good amount cheaper. They have them on ebay as well for $350 shipped.
190 Watt-Hour Advanced Lithium-Polymer Battery Pack with modified Magsafe power cable to power Apple MacBook Pro 15" and 17"
Rechargeable, super high-capacity, advanced Lithium-Ion Polymer Battery Technology.