I saw a guy who had a light duty charger/maintainer plugged into an outlet controlled by the light timer on the garage door opener. The light (and outlet) would go live every time the opener operated, and I believe he could adjust the time it stayed on. If you opened the door in the morning to back out and let the car warm up, the charger would run for five or ten minutes. Same when you came home and put the car back in the garage. It was enough to maintain the charge in the battery, not intended to bring one to full charge.Thanks for the info @Curt Doles I have a trickle charger and I use it frequently. I'm curious about what you consider a high quality trickle charger. Perhaps my harbor freight job isn't cutting it? It does make a difference and that is why I keep using it. It has rescued my not so good batteries many a time. It's just that when the cold sets in, its not enough. I'm still thinking that I just have bad luck with tractor batteries. For now, the jump pack I just got is working out good.