File:Ray-O-Vac Radio 'B' Battery, 45 volts, French Battery Company, Madison, Wisconsin - National Electronics Museum - DSC00237.JPG - Wikimedia Commons
Pavek Museum - We have a few batteries around the Pavek, because you need batteries to run radios! All early radios, except for crystal sets, required batteries to work. A radio needed
Eveready #482 "Mini-Max" "radio B" battery | National Museum of American History
Bid Now: Lot of 15 Vintage Batteries - April 3, 0123 11:00 AM EDT