Found this old 6 volt Eveready battery.

What did they fit?

1943 Tesla.

I think they were more along the lines of the

metal can with a 6v light head mounted to it and a handle the batteries went in the can and got wired up

almost looked like a small tool box with a top handle and car headlight attached to the front.

That top connector looks to be about a 300 amp fuse size.

Radios

Old metal/mine detector

Bigfoot castrator light batteries

Dad had an electric fencer that had those early 60's that i remember it don't know when it was bought

Those old batteries were called "dry cell" batteries, used for odds & ends direct voltage hookups..

BINGO !
Good one for sure, thanks

I remember , my dad worked for a rural telephone company.In the 1940 -50 era They had the old wooden telephones with the mouthpiece on the front and an ear piece you held in your hand THere were 3 of these batteries in a box at the bottom. The barrery;s would run down and need replacing .probably once a year. old 243

This

Old dry cell batteries, I saw them being used for doorbells in the fifties!