Bought an AGM battery today!

[motoman]

To my mind the lithium doesn't cost a lot more than an AGM and the weight savings on a 540 pound bike that is already down around 500 pounds starts to add up.

I suggest avoiding a lithium style batt. Just for reference, prior to you being part of this site, had a member here located in Montana who totally restored a crotch rocket style bike and opted to your suggestion just for the weight loss........bad option, least in his case. He got halfwys down driveway to main rode and wa-la........battery exploded and burnt most all his previous good work. IIRC, battery brand was a Sheori(or however it's spelled), and lithium style.
Problem being those style batteries are apparently not compatible with conventional style charging systems........anyways, in short, an expensive lesson learned by him.

[Bonz]

Yeah, I heard about that. The batteries have come a long way in terms of reliability and safety, IMO. In reality traditional batteries give off fumes that can cause explosions when simply trying to hook up for a jump start.