Many years ago, my brother in law gave me his AGM battery when he shipped his motorcycle. Despite sitting for months at a time on his bike, the battery was strong and cranked my garden tractor with vigor, even with its smaller size. When it finally gave up, I replaced it with a typical lawn and garden battery, then two years later, another. Even when new the LG batteries don't have the power of the AGM. My current battery is struggling in the colder weather. I am thinking about another AGM but they are $80 vs $30-$40 for the LG batteries. The AGM would need to last 6-8 years to break even. Worth it?