So just how small is Fuel? According to the creators, it is 1.3-inches tall, 0.9-inches wide and 0.5-inches thick (33 x 22 x 12 mm). The housing of the device is made with die cast aluminum and weighs around half an ounce (about 14 g). Most of the interior is taken up by its 220 mAh lithium-ion battery.
Obviously, in a device this small you are not going to see a battery with crazy high capacity. Still, it's claimed to provide about 20-30 minutes of additional talk time, and up to a couple hours of standby time, depending on the phone.
The Fuel charger features a standard micro-USB port, so it will be able to provide juice to most phones. Sadly, iPhone owners are currently left out of this one, though Devotec does appear to be planning the release of a version with an iPhone 5/Lightning connector at some point in the near future.
The creators claim the device can retain its charge for anywhere between a month and three months before needing to be charged, and comes with a power switch designed to keep it from discharging needlessly. Three LEDs inform the user of its current status (charging, fully charged, and so on).
Fuel has blown past its US$20,000 goal on Kickstarter – it's currently sitting at well over $60,000 with almost 3,000 backers. The minimum pledge to grab a Fuel charger is $20, and there's a little over two weeks left in the funding period. Devotec Industries expects to deliver the devices to backers in July of this year.
The Kickstarter pitch below provides more information on Fuel.