Sure, those little portable chargers that fit on a keyring can give your iPhone’s battery a boost, but they don’t have the juice to revive a dying iPad. If you’re looking to keep your iDevices alive during, say, a long-haul flight, you’ll need a battery pack with a bit more power.
Not only can the $17 GreatShield PowerTank (a pretty good deal, considering that these types of chargers usually sell for $30 or so) fully charge a dead iPad, it can charge both an iPad and an iPhone at the same time. The 10-ounce PowerTank can also charge Android devices, Kindles, as well as just about any gadget that can receive a charge via USB.
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