I've been buying batteries for these skis for 5 years. I buy 3 or more batteries a year. I found a new source for me. Batteries Plus. For about the same price as batteries at Auto Zone or O'Reilly's. I can get a 2 year warranty from Batteries Plus. Auto Zone has crap batteries and a crap warranty to boot. (Couple of months) I just bought a battery for my motorcycle with a 2 year warranty which is hella good for me. I asked about the Jet Ski batteries and thought I'd share. I'm gonna give them a try. Batteries last year ETX16L AGM were $109 from the companies I mentioned.
I never tried the 20.
I never tried the 20.