File:Ray-O-Vac Radio 'B' Battery, 45 volts, French Battery Company, Madison, Wisconsin - National Electronics Museum - DSC00237.JPG - Wikimedia Commons
File:Radio 'B' Battery, 22.5 volts, Sears, Roebuck & Co. - National Electronics Museum - DSC00233.JPG - Wikimedia Commons
![1924 Ad Eveready Radio Batteries National Carbon 45-volt B Battery No. – Period Paper Historic Art LLC 1924 Ad Eveready Radio Batteries National Carbon 45-volt B Battery No. – Period Paper Historic Art LLC](https://www.periodpaper.com/cdn/shop/products/SCA4_225.jpg?v=1571711659)