On Sat, 26 Nov 2016 11:37:15 +0000, Dave Plowman (News) wrote:

The first car I owned was a 1954 MG Magnette. Which had a battery clamp.
And all the many I've owned since have a method of securing the battery
too.

I've had scores of cars over the decades and most of them had unsecured
batteries for whatever reason. It has never caused me the slightest
difficulty.