675 Zinc-Air Hearing Aid Battery
This No. 675 zinc-air 1.45 volt hearing aid battery was made by an
unknown manufacturer.
Zinc-air batteries began replacing mercury batteries in hearing aids
beginning in 1977 although they did not really become popular until the
mid 1990s. In 1996 the USA phased out mercury batteries. Since then,
zinc-air batteries have been used.
The No. 675 zinc-air battery measured 0.455" in diameter by
0.205" thick and weighed 0.05 oz. (1.7 g)
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The top side of a No. 675 zinc-air hearing aid battery showing the
smaller negative terminal.
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Edge view of a No. 675 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. 675 zinc-air battery showing the
blue tab covering the bottom and sealing the air holes. This kept the
air out until the battery was ready to be used. When the tab was
removed, the battery started "working" and even if you didn't use it, in
a few weeks it would be dead.
The reason for doing this was to give zinc-air batteries a long shelf
life.
A blue tab is the
standard color for all 675-sized zinc-air batteries, no matter who makes
them.
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Bottom view of a No. 675 zinc-air hearing aid battery showing the
positive terminal indicated by the + in the center. Note that this version
had 6 air holes.
Note: After taking off the blue tab, it is best to wait a couple of
minutes before inserting the battery in the hearing aid in order for the
air to get inside and begin to work. If you just rip off the tab and put
the battery in your hearing aid, the voltage may be too low to operate
the hearing aid. |
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Bottom view of a No. 675 zinc-air hearing aid battery showing a
version with a whopping 9 air holes. For whatever reason, different manufacturers
at different times used a different number of air holes. As shown in the
accompanying pictures,
the number of air holes ranged from 2 to 9.
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Bottom view of a No. 675 zinc-air hearing aid battery showing a
version with 4 air holes. Having 4 air holes is the most common version.
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Bottom view of a No. 675 zinc-air hearing aid battery showing a
version with 3 air holes.
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Bottom view of a No. 675 zinc-air hearing aid battery showing a
version with 2 air holes. This battery was made in Japan. I don't know
what the 35 after the name "Japan" indicated.
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Bottom view of a No. 675 zinc-air hearing aid battery showing a
version with 2 air holes.
This battery was made in Japan. I don't know what the 50 after the
name "Japan" indicated.
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