I’m still trying to get a handle on battery life.
I know I had a “3 year warranty” battery fail on me in less than 3 years and I’ve heard from others with similar stories, yet you (and others) have spoken about a 5 year life-span.
I commute 5 days a week on my motorcycle with the odd week-end ride too, so that’s probably a factor in my reduced longevity.
Re. advantages/disadvantages, sealed gel cells might be safer in an accident I guess.