External battery for MacBook — now there are three

First there was HyperJuice, then came CHUGPLUG, soon, there'll be BatteryBox:

http://the-gadgeteer.com/2014/03/26/bypass-your-macbook-airs-battery-with-the-batterybox-and-charge-your-tablet-and-phone-too/ / CHUGPLUG external battery worry running out power traveling CHUGPLUG design designer designed 45 60 Watt 45W 60W newer MacBooks up to 4 extra hours power 11 inch 13 inch 11″ MacBook Air extra hours 13″ MacBook Air MacBook Pro weigh weighs 1.1 pounds accepts 100 240 100-240VAC 1.2A 50-60Hz AC power outputs 120-250V DC power fit between MacBook’s MagSafe power adapter power cord charge internal lithium-polymer battery 2 hours power laptop Lenmar Enterprises external batteries charge phone tablet laptop 50Wh energy juice power charge mobile device double battery life MacBook Air charge recharge bypass bypasses internal battery recharge cycles extended extends life BatteryOS LiIon lithium-ion batteries increased higher capacitydegrade over time 3000 full charge and discharge cycles MagSafe2 device charged USB /