I run a battery conditioner on the car. I use a
Ctek which I bought new from an eBay seller. Excellent chargers.
Welcome to the forum Hooky.
I also bought a Ctek from an eBay dealer. Neat Size & Excellent with three alternative in line 'plug in' connectors including one for Cigarette Lighter port use convenience. - low price as well.
Regarding the Battery Type, does anyone know if the Roadster 100 uses the same type?