Para,
believe it or not my battery is still the original, when I bought the bike it was cream crackered but as I ride every day after a few weeks it was fine again. Now after the recent cold snap I have been having to jump start it from time to time.Which is a pain in the behind but only takes about ten minutes to do. (Undo the tank for access). Maybe what I should do is just go the optimate way. As recently I have been working less with the bike therefore after six days non use it won't start. But once I use it its OK again as long as I ride twice in the week.
As my avatar says "ride to work and back" that is exactly what I do and if I work from home it does not get used....