Although regulations vary by state, federal law classifies electric bikes as bicycles, and no license or registration is required as long as they don’t go faster than 20 mph and their power doesn’t exceed 750 watts. Price largely determines weight, quality and battery type. A few hundred dollars gets you an IZIP mountain bike from Amazon with a heavy lead-acid battery. For $1,400, you can buy a 250-watt folding bike powered by a more-powerful, longer-lasting nickel-metal hydride battery like those in a camera or a Toyota Prius. At the high end, $2,525 buys an extra-light 350-watt model sporting a lightweight lithium-ion battery similar to a laptop’s. Most models can go at least 20 miles before plugging in to recharge, and fully recharging the battery on a typical model costs less than a dime. More
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