No. 312 Zinc-Air Hearing Aid Battery
This No. 312 1.45 volt zinc-air hearing aid battery was made by an
unknown manufacturer, probably around 1996.
The No. 312 zinc-air battery measured 0.305" in diameter by
0.135" thick (0.78 x 0.33 cm) and weighed 0.01 oz. (0.35 g).
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The top side of the No. 312 zinc-air hearing aid battery showing the
smaller negative terminal.
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Side view of the No. 312 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 the No. 312 zinc-air hearing aid battery showing the
standard brown 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. 312 zinc-air hearing aid battery showing the positive terminal
(+) symbol (center) and 3 air holes around it. For whatever reason,
manufacturers used various numbers of holes in the same size of battery.
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Bottom view of a No. 312 zinc-air hearing aid battery showing the
positive terminal (+) symbol (center) with a single air hole in the
center.
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