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I'm not affiliated with this product at all and don't sell it. I just saw the brochure in a mechanic shop and thought , "What a handy gadget!" It's called a "battery brain" by Smart Energy Solutions. It monitors your battery voltage and disconnects the battery when it gets too low. You then reset and start your engine. Boats with a lot of gadgets on board could certainly benefit. Their website is www.smgy.net if you're interested. Could save us from a lot of trouble.
Mike