There are few things more disturbing for a geek than getting out of your home or office and realizing that your phone or MP3 player is about to go dead. Every time I get out and realize my phone is going to go dead any second, it seems I am waiting for an important call.
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A small 70x50x12mm gadget from Brando can keep you powered up with a 2400mAh rechargeable battery that puts its juice out through a standard 5V USB output. That means that you can keep any device that is capable of charging via USB running.
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The USB Power Backup comes in two colors, black or white and sells for only $20 making for some cheap insurance against missing calls. The internal battery of the charger takes three hours to fully charge and a built-in short circuit or over discharge circuit keeps your gear safe. via Brando