Great smartphones like the iPhone have a nasty drawback: the better they are the more we use them; the more we use them the more we run out of battery. External power packs have been around for years, but products like Ventev Powercell 3000 are getting small enough to actually get widespread use. It's 10 hours of extra juice for $60. The Powercell 3000 is one dozens of low-profile and eco-friendly products from Ventev, a division of TESSCO Technologies of Hunt Valley.
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