Problem is, I live in the cold, New England.
I don't live in Italy or Florida.
I like to ride when it is chilly outside.
I bought a Lithium Iron battery for my Triumph 1200, and it was a disaster.
I'd get 3-5 cranks from cold, and almost always..."clack clack clack" of the sprag clutch.
Installed a new Yuasa AGM, fires right up, first time, every time.
Until I get cold start capability, I'm not switching.