My Ace Pulse Commander 72MHz wide band RC transmitter used the larger 9V Eveready. Later I replaced it with a 6 cell AA pen cell holder, toward the end of wide band acceptance some 25 or so years ago.
Speaking of vintage RC radio batteries, My 1953 DeBolt Model Engineering Company (DeMECo) 34" Livewire Kitten half-A single channel RC plane shows various flight battery arrangements for the super-regenerative tube (valve) radios of the day. It uses several 22.5 Volt batteries in series for the "B" supply. I remember those photoflash batteries in the 1960's, powered my portable flash units that used M3B flashbulbs. (This was before modern strobe flashes.) They looked just like 9 Volt transistor radio batteries, smaller one in your photo, except they were about 1/4" longer.
I attempted to locate a photo of it without success. What I found instead appears to be similar, except the contacts have been changed to top and bottom and rivet head type contacts, which seems to correspond with the ones in the Kitten's diagrams. That is one I haven't personally seen. Battery photos were obtained from
2Pcs 15F20 22.5V Battery 412U15VS084 MN122 Carbon Zinc High Capacity ATLANTIC US