My weird but somehow productive technique is to use a C-Tek smartcharger once a month during storage. With no charger and a Spring boost from car my bike batteries were lasting 2-3 years. With a C-Tek smartcharger plugged in often my batteries were lasting 5 years. In 2012 I bought the Mighty Max for $50 and it was still OK but I decided to replace it last year. My Benz battery using the same procedure also lasted from 2015 to now.
No idea why but i am surely sticking to that procedure and just charge the stored batteries the first of every month.
Ahh appreciate you sharing your battery maintenance technique. This is my first cold season riding so still newbie. Have a little knowledge around the garage tho. Been wanting a bike for a long time but was going thru wife concern leakage. I could have solved the problem by doing a wife delete mod but opted out with the cheaper route by purchasing my bike when she was not home. So far so good... Be safe!
I run the YTZ14S in Trinity. Installed it back in June 2022 to replace the YTZ12S. Cheap battery and should last at least 3-4 years with the Battery Minder I plug in to keep it topped off when not riding.
Just the fact it has a higher amp hour rating of 11.2 vs 11.0. Though not much difference it might help with all the added electrucal stuff I have added to the bike like heated grips.
Or if I leave the aux lights on it might start with the bigger capacity battery if I catch it in time. Or if the alternator takes a dump I could run for longer off the bigger battery which might be the difference between getting home and getting towed.
The YTZ14S battery weighs about 8 oz more than the stock YTZ12S but the physical dimensions are identical. It fit in the bike fine.