WE did use Battery Tenders but have switched to Optimate smart chargers. They charge all types of batteries. Optimate 3 is the least expensive and basic. We also have a couple of Optimate 6's.

1970 Superbird 440-6bbl, auto
1969 Barracuda 340-4bbl, FB Formula S auto
1969 Barracuda 6.1 L Hemi, 5 speed, Convertible
2022 Can Am Spyder RTL