The Price:

$40

The Verdict:

Affordable and useful.

The Uno is portable—a lot more portable than the original Fueltank, which charged two things simultaneously. The bonus of not having two is that you can actually pocket this one, if you're the kind of person who really needs to make sure your devices are powered.

Other than the fact that it's smaller, lighter and more discreet than the Fueltank, there isn't a whole lot of difference. We shoved a bunch of our gadgets into it and the Uno charged all of them fine. You even get 2 tips (an iPod one and a mini USB one) for free. The only downside is that it's give-or-take about half the capacity of the regular Fueltank, which isn't that much larger. It's just larger enough that you wouldn't want to pants it.

For $40, the Fultank Uno is a pretty cheap safety net for the times when you forget to charge your phone. [Callpod]

Compact enough to carry with you all the time

Uses Callpod's many tips, so you should be able to find one for your phone or device

Doesn't hold as much charge as its bigger brother, the Fueltank

The upside is that it's $40, and you don't always have to charge two devices simultaneously. The advantage to using this over a specialized charger, like an iPhone battery pack, is that you can also take advantage of Callpod's various tips for their Chargepod adapter. It should fit almost all devices out there now.

The Fueltank Uno will be available at Best Buy starting Sept 27. Callpod's mobile password app, Keeper, is also being pushed out to Vodafone customers as well. Basically, it's a desktop password management that can also sync to your cellphone so you can take your passwords with you. You can get that now for $15. The phone part is free. [Callpod]

The Price: $70 online, but should be available at Best Buy for $60

The Verdict: Convenient. The Fueltank does exactly what it says it does: charge two devices simultaneously on the road. It's made even better because the charging tips are the same ones used in the Chargepod, so you can support just about every mobile gadget you have.

In our test, a completely empty Windows Mobile phone and a completely drained Callpod Dragon charged up to full in about three hours. After this, the Fueltank still had enough juice left to power the phone for another two hours. One quirk though, is that the battery status display only works correctly when the Fueltank isn't plugged in to a power source, and displays somewhere between half to full power when you activate it while it's charging via a wall socket. It works correctly when disengaged and powering other devices.

It's kinda similar to the Powergorilla that we tested last week, but only for smaller portable devices and not laptops. In our view, it's definitely worth $60 as a backup or extended battery, especially if you've got a phone like the T-Mobile G1 that can barely last a day on moderate use. The Fueltank is the same thickness and about 1.5x as wide as the G1, so it's easily slipped into your laptop bag. A good device for anyone who travels regularly and needs supplemental power where there's no outlets to be found. [Callpod]