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-   -   BATTERY WITH INVERSE VOLTAGE ? (https://www.diybanter.com/electronics-repair/44728-battery-inverse-voltage.html)

mowhoong May 10th 04 07:59 AM
BATTERY WITH INVERSE VOLTAGE ?
 
I keep one funny battery for 20 years ago, it was a size AA, 1.5 volt.
The reason was this battery'polarity was invert when you measure,
untill to day I
don't understand why ? Can any person know what is going on. Thanks

gothika May 10th 04 10:48 AM
BATTERY WITH INVERSE VOLTAGE ?
 
On 9 May 2004 23:59:47 -0700, (mowhoong) wrote:

I keep one funny battery for 20 years ago, it was a size AA, 1.5 volt.
The reason was this battery'polarity was invert when you measure,
untill to day I
don't understand why ? Can any person know what is going on. Thanks

I take it that it's a rechargable? maybe nicad?
If you let the dwell on these batteries drop to low they can reverse
polarity.

mowhoong May 12th 04 04:46 PM
BATTERY WITH INVERSE VOLTAGE ?
 
gothika wrote in message . ..
On 9 May 2004 23:59:47 -0700, (mowhoong) wrote:

I keep one funny battery for 20 years ago, it was a size AA, 1.5 volt.
The reason was this battery'polarity was invert when you measure,
untill to day I
don't understand why ? Can any person know what is going on. Thanks

I take it that it's a rechargable? maybe nicad?
If you let the dwell on these batteries drop to low they can reverse
polarity.

It was alkaline battery.

Sandra May 12th 04 07:13 PM
BATTERY WITH INVERSE VOLTAGE ?
 
(mowhoong) wrote in message . com...
I keep one funny battery for 20 years ago, it was a size AA, 1.5 volt.
The reason was this battery'polarity was invert when you measure,
untill to day I
don't understand why ? Can any person know what is going on. Thanks

Maybe it was in series with a bunch of other cells, and the device has
been used until no single drop came out of the batteies. This cell was
empty first. It has been charged reversely by the others that were not
completely empty.
(just a guess)

Sandra

Sandra May 12th 04 07:19 PM
BATTERY WITH INVERSE VOLTAGE ?
 
(mowhoong) wrote in message . com...
I keep one funny battery for 20 years ago, it was a size AA, 1.5 volt.
The reason was this battery'polarity was invert when you measure,
untill to day I
don't understand why ? Can any person know what is going on. Thanks

Maybe it was in series with a bunch of other cells, and the device has
been used until no single drop came out of the batteies. This cell was
empty first. It has been charged reversely by the others that were not
completely empty.
(just a guess)

Sandra

Asimov May 13th 04 04:41 AM
BATTERY WITH INVERSE VOLTAGE ?
 
"mowhoong" bravely wrote to "All" (12 May 04 08:46:06)
--- on the heady topic of " BATTERY WITH INVERSE VOLTAGE ?"

mo From: (mowhoong)

mo gothika wrote in message
mo . .. On 9 May 2004
mo 23:59:47 -0700, (mowhoong) wrote:
I keep one funny battery for 20 years ago, it was a size AA, 1.5 volt.
The reason was this battery'polarity was invert when you measure,
untill to day I
don't understand why ? Can any person know what is going on. Thanks

I take it that it's a rechargable? maybe nicad?
If you let the dwell on these batteries drop to low they can reverse
polarity.

mo It was alkaline battery.

I found a defective electrolytic which acquired a permanent voltage
and it still measured a couple of volts the last time I looked at it.
Big caps normally show a permanent voltage of a few 10's of millivolts
but this it isn't a very big cap, only 47uF & 35WV, high esr though.

Asimov
******

.... A couple of volts below threshold.


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