So, from what I've seen, expect a life from 1 year to forever. My 96 CBR900RR had the original battery when we sold it about 2 years ago. Very unheard of, really. As for the Shorai and it's counterparts, the dealers I've talked to have raved about them, the forums and owners seem a bit apprehensive. I'll wait, for now.
Ducati S4 916 is history.
KTM 950 SM, my main squeeze now.
And now, an XR75,