I've had a sealed gel battery for three years and it works great. Anyone I know who has tried a lithium battery hated them. They don't work well in cold weather( I see you're in Wisconsin) and just don't seem to have as much cranking power as a similarly rated lead acid battery. How long a lead battery lasts really depends on how you take care of it. If they go unused for long periods of time in freezing temps it tends to shorten their life by a lot. I put mine on a trickle charger during the winter. I had a battery in my boat that was rated for 5 years, I always keep them inside on a trickle charger in winter.It was still working fine when I replaced it after 8 years.