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The Spark's 39 Watt hour battery has both a high-powered USB port for tablets and a standard USB port for phones and other handheld electronics.
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Early pico phones delivered about five lumens per battery watt.
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The Turbo battery has 342 Watt-hours of real capacity, meaning that all of this energy can actually be used by the rider instead of some theoretically possible calculated number.
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The 48 Watt charger will rapidly bring the battery to full capacity in about 2.5 hours.
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Not much, admittedly, when compared to the 128 watt-hours per kilogram of a lithium-ion battery, like that found in many electric cars.
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The two-watt Atom chip inside the Series 5 is rated for about nine hours of battery life, whereas the Core i5-powered Series 7 is expected to last between four and five hours on a charge. (The Series 5 is lighter, too, at 1.65 pounds, compared with 1.89 for the Series 7.) And, being a lower-powered device, the Series 5 has no vents.
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