Varta No. 20 DK Rechargeable Hearing Aid Battery The Varta 20 DK rechargeable hearing aid battery was made by Varta AG of Germany around 1965. The Varta 20 DK battery measured 0.450" in diameter and 0.225" thick(1.130 x 0.590 cm). |  | Click picture for larger view | | |   | | | |
| Top view of the Varta 20 DK rechargeable hearing aid battery showing the negative terminal. In the center is the letter "P".
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| Side view of the Varta 20 DK rechargeable hearing aid battery showing the flange around the top.
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| Bottom view of the Varta No. 20 DK rechargeable hearing aid battery showing the positive "+" terminal. It reads "20 DK" (top) "+" (center) and "Varta" (bottom).
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