I finally replaced the original Yuasa battery in my 2008. I can't complain about that kind of life span. I replaced it with a Tusk Lithium battery, from Rocky Mountain ATV. It came with a bunch of foam pads, but I didn't need any of them. Perfect fit as it. Seems the starter turns over a bit faster now. Just in case anyone is looking for a lighter replacement.
https://www.rockymountainatvmc.com/p/1647/53776/Tusk-Lithium-Battery?v=9919