General EP-140 Carbon Hearing Aid Battery The General EP-140 was a 3 volt zinc-carbon hearing aid battery used in carbon hearing aids around the early 1940s. It was manufactured by the the General Dry Battery Company of Cleveland, Ohio. The General EP-140 battery weighed 8.0 oz (226 g), and measured 4 1/16" high by 2⅛" wide by 1⅛" thick. |  | Click picture for larger view | | |   | | | |
| Front view of the General EP-140 carbon hearing aid battery.
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| Rear view of the General EP-140 carbon hearing aid battery showing the model number "EP 140" and the voltage "3 volts".
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| Top view of the General EP-140 carbon hearing aid battery showing the battery terminals. The terminals were set along the back edge of the battery, not in the center. Note that the left terminal is thicker (⅛") than the right terminal (3/32") to prevent this battery being plugged in backwards and thus reversing the polarity. The terminals are set 1" (2.5 cm) apart. |  | Click picture for larger view | | | |
| Bottom view of the General Ep-140 carbon hearing aid battery.
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