I've had poor luck with wet-cell motorcycle batteries as they don't have much space for electrolyte. Unless you check them often it is easy to boil off liquid, ruining the battery, which I have done often. On my Kwacky 500 the battery is so buried it is something like a 15-minute operation to get to the battery, fill up, and put everything back together. I didn't do it often enough and killed the last battery before its time. I switched to a maintenance free AGM battery and it has lasted well for two years, including one complete discharge due to my leaving the lights on. They also hold a charge very well over the winter, even if it gets very cold like it does here in upstate NY. I leave the battery in the cycle and only plug in a charger every couple of months when I get a warm day, though it doesn't really seem to need it. I would rate AGMs as excellent in a motorcycle application.