In Pictures: 9 wireless battery chargers: No power? No problem!

Tired of having to fumble for the USB port every time your mobile device runs out of power? With these wireless chargers, just put your device down and let it it power up.

Wireless chargers are about convenience. Plop your mobile device on a charging station and as long as it's within range (5mm or .20 in. for most chargers) it will power up, no wires needed (but at a slightly slower rate than a wired charger).

The technologies incorporated into most of these chargers is Qi, a standard developed by the Wireless Power Consortium. It transfers energy from the charger to your device through an electromagnetic field. If your phone doesn't have Qi built in, there are a variety of Qi-compliant cases available.

Meanwhile, a merger between the Alliance for Wireless Power (A4WP) and the Power Matters Alliance (PMA) could provide another alternative.

Need a boost? We've assembled one PMA and eight Qi-enabled chargers.

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