I've written about several mobile accessories from Just Mobile, including the AluPen Pro Stylus and the Slide iPad Stand, both with the trademark "design objects" look and feel of solid metal.
But the Just Mobile line also includes power accessories, including car chargers and the Gum line of portable batteries in rounded solid aluminum cases.
These include the thumb-sized Gum compact charger with 2200 mAh capacity, the Gum Pro with 4400 mAh (around $55), and the bulkier Gum Max for tablets with 10,400 mAh (around $90).
But the newly-updated Gum Plus provides a nice balance of relatively compact size with high capacity suitable for charging iPads and tablets in addition to iPhones and smartphones.
(The stats: It's 3.1 x 2.3 x 0.9 in., with 5.200 mAh capacity (up from 4400) and 2.1A current output. The case has 5 LED lights to display the power level.)
These batteries have two USB connectors -- they charge your devices from a standard USB connector (i.e., using the cable that came with your device), and then recharge the battery through a separate miniUSB connector.
The Gum Plus (new version) is now available for around $74, in silver, black, red, and titanium.
Find the Just Mobile Gum Plus on Amazon.com