Burgess No. T3R Hearing Aid Battery The Burgess No. T3R was a 4½ volt battery used in some carbon hearing aids from 1936 through the mid 1940s. It weighed 10 oz., and measured 3¼" by 1⅛" by 4⅛" high. The patent for this particular design was filed on February 4, 1936, but wasn't given approval until December 17, 1940. |  | Click picture for larger view | | |   | | | |
| Close up of the back side of the Burgess T3R battery. This battery was supposed to be used by Aug. 1942. The patent number was 2,225,460. Click on the patent number to see the paperwork submitted for this patent. This patent was for a soft rubber plug arrangement so the pins didn't have to be precisely aligned, or of precise size.
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