Quote Originally Posted by Dutch552 View Post
I move the two head units of my Humminbirds to the house because I don't want to chance it-too much $$$ and too easy to do. The batteries stay hooked up to a digital onboard charger that goes into trickle mode after 21 days and I've never had a battery freeze on me.
2X Dutch. Battery Tenders over the winter, but then I have two Optima gell cells for my troller and they're pretty resilient.