I also remember a 4.5V rectangular battery
with screw terminals - the screw part was a stepped conical shape, IIRC;
that's not listed on the Wikipedia page.

The Eveready 126, it was even labelled "bell battery" at one time. Originally it had all brass screw terminals later versions black conical plastic screw terminals. My first Scalextric set had a plate that you attached three of them using the terminals, used as a power supply, transformers at that time being quite expensive and having to be bought separately and not supplied as part of the set. Many a Xmas ruined by parents forgetting to buy the PSU.

Richard

https://www.radiomuseum.org/r/ever_battery_126.html