On the C14 that's an issue as it's impossible to push start it with a flat battery.
I have had to push start my motorcycles a few times over the years due to failed batteries.
These days I have Breakdown Recovery so I would call them and get them to jump start the bike so I can get it home.
Most decent batteries last 4-8 years depending on how they are treated.
I don't consider Yuasa to be a decent battery. Most of the failed batteries I have had were Yuasa.
They suffered (and so far as I can tell from the numbers of failed Yuasa motorcycle batteries on various forums, still suffer) from a design flaw where a weld between 2 cells will break, which renders the whole battery useless.
Since I stopped using Yuasa, I have not had one single battery failure. They just fade away giving fair warning that they are soon going to die.