About batteries

Is this possible?

My friend tells me that using AA batteries for his digital camera he
gets the following results;

First situation:
Rechargeable batteries rated 1.2 volts after charging the batteries
he reads : 1.359 volts Is this normal?


Second situation:
With regular AA batteries there is no voltage indicated on the
batteries;

but at one point his camera will tell to change the batteries; he
checks the voltage and he gets a reading of 3.389 volts
How is this possible?

Den

 

Sure, though he's likely over-charging them with a dumb charger.

Define "regular". Define the circumstances. No, this is not
normal.

The internal resistance of a battery will climb as it discharges.
At some point a "regular" battery will not be able to supply the
load. However, when it's taken out of the camera (and has no
load), the voltage from its intrinsic chemistry may be evident.

Testing batteries without a load is a usually waste of time. You
might be able to find a shorted cell, but rarely weak ones.

 

Thanks for the explanation Keith;

Does that mean that those little batterie testers
are useless?


Den

 

Battery testers come in all sorts. If they load the battery, they're
useful, particularly if they have a differing load for each battery
type/size. If they're simply a voltmeter they're next to useless.

 

With regular AA batteries there is no voltage indicated on the

Maybe these AA batteries aren't "regular"? I've seen 6V batteries that look
like AA batteries before...

Andrew Howard

 

It's normal for a Ni-MH to measure about 1.4V at full charge.

The normal AA alkaline cell will measure about 1.3 to 1.4V when it's
getting low. It's easy to tell a fresh cell from a used cell by
measuring it with a DMM on the 2V range.


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Not true. See other post.

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###Got a Question about ELECTRONICS? Check HERE First:###
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My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
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Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
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I disagree. See other post.