During months of testing, we dropped it onto rocks (from about 5 feet) and dunked it in puddles—but it never faltered. The unit’s weatherproof design features two high-speed USB ports that are sealed against water and particulates by a patent-pending process (no protective plugs necessary). Plus, the Venture (7,800mAh) comes with flat, rubber-wrapped USB and micro USB charging cables that fit into the grooved edges of the charger. It takes five hours to power up from the wall, which gave us 3.5 charges for the iPhone 4s. Planning a longer trip? Juice the Venture in the field by connecting it to the included Nomad 7 solar panel for nine hours in full sun.