Battery Minders

I have used both battery tender and battery minder for many years. Bought from Northern Tool. I put them on our two cars that stay behind at home on long trips. I also use a 1.25 amp multi battery type and four stage charger for agm batteries, I think is called Genius 3500 or something like that. Excellent results keeping both coach batteries charged at once. Probably more than you neeed for a chassis battery.

I once used a cheap $20 Walmart type and ruined two batteries before I learned you get what you pay for. Lesson: buy cheap trickle charger, buy lots of batteries. Buy a good trickle charger, buy few batteries. Your choice.