Got a new battery yesterday and now all is well. I bumped the capacity up to factory spec as the PO had installed one size smaller (seems to be somewhat accepted on the boards for this bike, but why try to save $10 and go a bit lower power?).
Bike fires on the first hint of ignition, which it didn’t all of last year. I think I probably got every last second of use out of that old battery. And I took the advice and put the date on the new one. Thanks