Burgess No. W25 Hearing Aid "B" Battery The Burgess No. W25 was an unusual flat dual-voltage "B" battery used in certain vacuum tube hearing aids in 1939. It weighed 8.3 oz., and measured 5⅝" by 2 15/16" by ⅝" high. |  | Click picture for larger view | | |   | | | |
| Front view of the Burgess No. W25 hearing aid "B" battery showing the name and model number. This battery was made in Canada by the Burgess Battery Company. |  | Click picture for larger view | | | |
| Top front view of the Burgess W25 hearing aid battery showing the three battery contacts. The left one was for the 37˝ volt plate voltage. The middle contact was for the 13˝ volt grid voltage and the right contact was the ground.
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| Three-quarter view of the back and sides of the Burgess W25 "B" battery. There were no markings on the back or sides.
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