I bought a new battery for my riding tractor in May 2016. It barely turned the engine over later that season. I stored it indoors over the winter and connected a Smart-charger to it in March 2017.
When re-installed in my rider, it didn't have enough cranking amps to turn over the engine!
I returned it to O'Neil's with the receipt. The attendant said, "Yeah....those batteries have a 6 month warrantee."
???? 6 months!?!? So if you buy one in October, and it's stored over the winter, it will likely be out of warrantee by summer, when required!
I asked, "So why would O'Neil's want to carry a product like this. It doesn't look good on you. So, there is nothing you can do?"
The response was, "Nope."