HyperMac is an external battery pack for all Apple laptops. It's available in four capacities, ranging from 60Wh to the most powerful 222Wh, which we tested here. For comparison, the MacBook Air's battery is 37Wh. The device comes supplied with MagSafe cables for connecting to a MacBook, MacBook Pro or MacBook Air, and offers a USB port so you can also use it to run your iPod, iPhone or other USB powered device.



Link: TechRadar