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This battery charger plugs into the cigarette lighter or cell phone charging port in your car, perfect for charging 12v batteries in the field. With so much 12v equipment coming on the market, it's nice to have a convenient field charging option. These are also good back-up chargers. Even if you have a solar charger, or a generator with a standard charger, it's good to have a backup. The sun doesn't always cooperate and generators run out of gas...