Primo Cube: A Wee Secondary Battery For MicroUSB, MiniUSB Phones

Phones with gigantic screens, such as the HTC Evo, have a tough time lasting a full day on one battery charge. This makes having a secondary charger almost essential if you're going to be out and about all day.

The Primo Cube is a little square charger that plugs directly into either a MicroUSB or MiniUSB jack on a phone, no cables required. It works with almost any smartphone other than the iPhone, which is stubbornly USBless. For only $US40, something like this seems well worth it for owners of power-hungry phones. [PhoneSuit]

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