My S1 Roadster experience is quite different. I don't use the conditioner continuously, just every few weeks. A battery change at 13 years didn't seem to affect performance at all, and it will hold charge, certainly in summer for at least 3 months.
Whereas my Plus 4 loses charge after a week or so, which means I use the conditioner more often.
My Golf which sits outside and may not run for 3 months in winter holds charge for months.
