Life of leisure batteries

Bitter experience is that modern car batteries often work very well right up until they suddenly keel over and die, rather than the previous generation which sort of pined away for a while first. This was a nuisance but at least gave some warning.

Do Leisure batteries do the same? And how long do they tend to last, please?

We had a nice shiny new Leisure Battery, 110 Ah rating, with our 2nd hand caravan two years ago. So far it's always charging up nicely and the little indicator spot is showing green for healthy, so all seems well, but I'm wondering whether at some point it'll copy that car battery habit of sudden death at a vital moment. (Probably when we're miles from anywhere!)

What's your experience?

Thanks.