Maybe you're running the air conditioner too often?
I got an agm type for my last battery, and so far it seems fine. I read a review of a new motorcycle the other day, and they were describing the charging circuit as outputting more juice so that more accessories could be added without overtaxing the system. Now I am assuming that they control the amount that gets back to charge the battery, regardless of what the alternator is capable of putting out, but since the owner can pop in whatever battery he wants later on, it makes you wonder if the battery manufacturers themselves are keeping up and building batteries that meet these specifications.
It has always seemed curious to me that a car battery, which has to survive under a closed hood where the temperature extremes vary widely, should last so much better than a garden tractor or motorcycle battery, which has more air flow around it and therefore does not experience as wide a temperature extreme. It must be the mass of the battery itself, or maybe better charging circuits? Or, that the seasonal use vehicles sit for long periods of time? If that is your case, then a good battery maintainer would be worth the money.
One of the resident experts here will likely give you a much better answer.
PS- One of my life goals is to get to NZ to fly fish for brown trout, and now that I am riding again, I wouldn't mind renting a Tiger and doing some long days as well.
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