Just some
"for what it's worth" info for others curious.
Case size 7 Lithium-Ion battery from
valleyscooterparts.com was $49.99 shipped . .
scrappydogscooters.com has a similar battery, but shipping costs make it a little more expensive.
LI battery weighed around 3 pounds less, but was almost exactly the same size as the lead-acid battery it replaced. Tested around 12 volts when received, and around 13.3 volts after a 2 hour charge.
