NEW YORK ( TheStreet) -- When it comes to small-business mobile devices, one word says it all: Charge!For all the productivity fruit smartphones such as the Apple (AAPL - Get Report) iPhone 4, Motorola (MOT) Droid X and Blackberry (RIMM) Torch 9800 yield, the little worm called battery life is happily eating away at those gains. Why? Four-inch screens, phat 1 gigabyte processors and power-thirsty 3G/4G cellular networks all need electrons, and lots of 'em. So these wonder units are lucky to last through a day of real work. Some, such as the HTC EVO from Sprint (S), can go flat after just a few hours.
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