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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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rizabove rizabove
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11 years ago
I have come across a couple of AA batteries with reversed polarity?!?  Can any1 offer an explanation or has any1 come across the same thing?
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wrote...
#1
11 years ago
Manufacturing defect.
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#2
11 years ago
If they are rechargeables and were part of a series set (note, a single cell is not a battery), they were probably run flat completely, while their accompanying ones were still outputting.
They become reverse charged.
Otherwise if they are NiCad or NiMh cells and have had their outer casing removed, you will find what looks like a standard cell but is a bit smaller, and is reverse charged, i.e. the casing is positive.
The outer casing reverses that physically, to have the outward appearance and polarity of a standard cell.
wrote...
#3
11 years ago
I had that problem with a coin battery but I thought it was probably because it was lithium and the shape might have made a difference.
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