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      10-24-2020, 05:35 PM   #6
Billfitz
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Drives: '15 328iX GT
Join Date: Jan 2015
Location: New Hampshire

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A charger is usually rated at six amperes or more, being intended to take batteries from fully discharged to a full charge in a day or less. A maintainer is one to two amperes, being intended to top off a battery that's partially discharged, and to power a car when the car isn't running, so the battery won't be discharged. That's because modern cars with their electronics are never totally 'off'. I have one of these, which runs as a maintainer at two amps or as a charger at eight amps, on sale at a very good price today: https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1