No. 13 Zinc-Air Hearing Aid Battery
This No. 13 1.45 volt zinc-air hearing aid battery was made by an
unknown manufacturer, probably around 1996.
The No. 13 zinc-air battery measured 0.305" in diameter by
0.208" thick (0.78 x 0.5 cm) and weighed 0.02 oz. (0.5 g).
The No. 13 battery was quite thick as compared to its diameter,
unlike most other button batteries.
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The top side of a No. 13 zinc-air hearing aid battery showing the
smaller negative terminal.
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Side view of a No. 13 zinc-air hearing aid battery. The negative
terminal is at the top. Everything else is the positive terminal.
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Bottom view of a No. 13 zinc-air hearing aid battery showing the
standard orange tab that covers the air holes so the battery won't
activate while on the shelf.
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Bottom view of a No. 13 zinc-air hearing aid battery showing the positive terminal
(+) symbol (center) and 5 air holes—one in center and four around it.
For whatever reason various manufacturers used different numbers of air
holes ranging from 1 to 5.
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Bottom view of a No. 13 zinc-air hearing aid battery showing the positive terminal
(+) symbol (center) and 4 air holes around it.
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Bottom view of a No. 13 zinc-air hearing aid battery showing the positive terminal
(+) symbol (center) and 2 air holes—one on either side of it.
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Bottom view of a No. 13 zinc-air hearing aid battery showing the
model number (13) at top, the positive terminal polarity symbol (+) at
left, the the single
air hole (center) and
that it was made in Japan (bottom). Some of these have the number 70 to
the right of the word Japan and others have the number 72 (as shown).
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