Acousticon Model B Hearing Aid Battery Charger The Acousticon Model B hearing Aid battery charger was made by/for Acousticon International around 1950. This is probably more of a battery "reconditioner", rather than a battery charger as we know of them today. It extended the life of the mercury and other batteries in use in the late 1940s and early 1950s. It measured 6¾" x 4½" x 1⅞" (17.3 x 11.5 x 4.8 cm) and weighed a hefty 1 pound, 9.8 oz. (732 g). |  | Click picture for larger view | | |  | | | |
| Front view of the Acousticon Model B hearing aid battery charger showing the various styles and voltages of the batteries it could "recharge". It could "recondition" 1½ volt "A" batteries, and 15, 22½ and 30 volt "B" batteries.
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| The Acousticon Model B hearing aid battery charger used 117 volt A/C power. It contained a selenium rectifier to convert the A/C power to D/C. The on/off switch is in the bottom right corner. The white cover (front center) glows orange when the switch is turned on (shown in the "on" position). |  | Click picture for larger view | | | |
Close-up view of the recharging station for 1½ volt button "A" batteries showing the negative terminal (bottom) and the positive terminal (spring clip).
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| Close-up view of the Acousticon Model B hearing aid battery charger with a 1½ volt small button "A" battery (RM-1 size) in place for recharging. Note: in button batteries, the bottom and outside of the battery comprised the positive terminal. This was opposite to what was common in "regular" batteries where the bottom and outside comprised the negative terminal. |  | Click picture for larger view | | | |
| Close-up view of the Acousticon Model B hearing aid battery charger with a 1½ volt large button "A" battery (RM-4 size) in place for recharging. This charger could also handle the No. 3 size button batteries. (No. 2 size button batteries were not used in hearing aids for some reason.) |  | Click picture for larger view | | | |
Close-up view of the recharging station for standard 1½ volt "A" batteries showing the positive terminal (left) and the negative terminal (right).
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| Close-up view of the Acousticon Model B hearing aid battery charger with a 1½ volt "A" battery in place for recharging. The 1015E battery is the same size as our modern AA batteries. |  | Click picture for larger view | | | |
Close-up view of the recharging stations for 22½ volt and 15 volt "B" batteries showing the negative terminals (left) and the positive terminals (right).
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| Close-up view of the Acousticon Model B hearing aid battery charger with a 22½ volt "B" battery in place for recharging. |  | Click picture for larger view | | | |
| Close-up view of the Acousticon Model B hearing aid battery charger with a 15 volt "B" battery in place for recharging. |  | Click picture for larger view | | | |
| Close-up view of the recharging station for 30 volt "B" batteries showing the negative and positive terminals (top). The spring clip at the bottom is for holding the battery in place. |  | Click picture for larger view | | | |
| Close-up view of the Acousticon Model B hearing aid battery charger with a 30 volt "B" battery in place for recharging.
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