How did your batteries last 9 years iron? I was lucky to get 5 with my gasser while live in anchorage. When we moved to Wasilla I kept a spare battery on a tender for the just in case factor.
I needed your luck...lol
Dunno. Must be the clean living!
Ive had good luck with auto batteries. Replaced the one in the van earlier this year.
https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/14447731/re-napa-legend-batteries8 years there and it had been fully discharged a few times.