Burgess No. U20 Hearing Aid "B" Battery The Burgess No. U20 hearing aid "B" battery was made by the Burgess Battery Company of Freeport, IL. It was a 30 volt battery used in some vacuum tube hearing aids in the early 1950s. It weighed 1.4 oz. (40 g ), and measured 2 9/16" x 1" x ⅝" (6.5 x 2.5 x 1.6 cm). |  | Click picture for larger view | | |   | | | |
| Front view of the Burgess No. U20 battery. Note it says it was used for "electronic and transistor circuits". Since it was a 30 volt battery, it was obviously used for vacuum tube hearing aids still being used in the later 1950s. It was equivalent to the Eveready 413E hearing aid "B" battery. |  | Click picture for larger view | | | |
| Side view of the Burgess No. U20 battery showing the direction of the positive terminal and giving its voltage (30 volts). |  | Click picture for larger view | | | |
| Opposite side view of the Burgess No. U20 battery showing the manufacturer's name, etc. |  | Click picture for larger view | | | |
| Top view of the Burgess No. U20 battery showing the positive terminal. |  | Click picture for larger view | | | |
| Bottom view of the Burgess No. U20 battery showing the negative terminal.
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