This is GM’s incredible secret stash of cars
Take an undercover trip round the General’s jaw-dropping collection of Cadillacs, Corvettes and crackpot concepts
Posted: 24 Jan 2014
1966 Electrovair II Experimental
An early attempt to crack the electric vehicle conundrum, the Electrovair II shunned lead-acid batteries in favour of silver zinc cells, which were three times lighter and considerably smaller. Even so, the battery pack still filled the entire engine bay.