Without getting into a battery switching system and/or a battery isolater (which would cost more than a separate charger) you would be better off just getting a trickle charger for the auxiliary battery. I use one made by Schumaker which I got at Walmart for less than $30 last year. If the battery is only used for lights & electronics the 2 amp charger will bring it back to life in a day at most. And you can leave it connected (like your onboard charger) and it will maintain the battery as well.


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