A 1966 concept vehicle, the Electrovair II was a 1966 Monza 4-door hardtop modified with a 532 volt, 115 horsepower electric motor replacing the gasoline engine—following a 1964 version known as Electrovair I. With the 1966 model, silver-zinc batteries were used and placed in the trunk and engine compartment, and the body was slightly modified to accept the conversion.