I think long continental more or less continual 10+ hour road trips dried out my odyssey battery till one day it just gave up (at less than 5 years of age).... like my Merc AGM battery it came back to full health when you open it up and top up with distilled water. (As some liquid returns to the "tissue" the plates get a chance to start working again) Check after 24 hours to ensure the plates are fully covered. 4 years on it can sit through winters with no charge and still retain 12.8v. The odyssey took phenomenal quantities of distilled water. The Merc battery is a 25kg monster and got 50 ml per cell, yet the baby odyssey needed up to 140ml on some cells. Luckily a year on its seems to be back to full health.
Last two bikes I bought motobatt AGM, lots of good reccos and tales of taking real abuse. But it doesn't look like you can top them up and the terminal connections are horrid rubbish
My TL had its original 10 year old battery and yet could do a hole year of not being run and not charged and still start the bike. It was incredible.
