Or you could just forget all the add on dew-dads and buy an Odyssey Battery. The first set in my diesel truck lasted 11 years. My truck sat for 2 weeks in sub-zero overnight cold one time in January. For a reason long forgotten, I had to start it up one night at -15 below zero at the end of that two week cold soak.. It started right up. My truck has never been kept in a garage either.
