The scoop: PowerDuo Reserve, by Griffin Technology, about $60.

What it is: This device includes three components – the PowerBock Reserve Battery, a wall charging docking station and a car charger docking station. The Reserve Battery, which connects to the two docking stations magnetically, can give iPhone and iPod owners additional battery juice when they need it by snapping onto the bottom of the portable device through Apple's Universal Connector. When fully charged, the Reserve Battery offers up to 24 hours of music, 6 hours of video, 1.5 hours of Web access and up to two hours of talk time (for iPhone). A button on the Reserve Battery lets you know how much juice is in it when pressed.

Why it's cool: The beautiful modular design of the battery and docking stations means users can put the wall charger in their home, the car charger in their vehicle, and the Reserve Battery can be charged by both docking units. The docking units also include a USB charging port, so you can recharge your iPhone/iPod simultaneously while you're recharging the Reserve Battery. Griffin has thought of everything by combining two types of device chargers along with a portable reserve battery. This will be the only charging system you'll ever need for your iPod or iPhone (and if Griffin sells additional Reserve Batteries separately, even better!).

Some caveats: One nitpick, but minor. I would have loved it if Griffin also included a USB charging cable for the iPod/iPhone along with the system, I had to go dig around for my cable to try that feature.

Grade: 5 stars.