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Discussion in 'Electronic Basics' started by Den, Nov 17, 2003.

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  1. Den

    Den Guest

    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
     
  2. 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.
     
  3. Den

    Den Guest

    Thanks for the explanation Keith;
    Does that mean that those little batterie testers
    are useless?


    Den
     
  4. 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.
     
  5. 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
     
  6. 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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    Subject: line with other stuff. alondra101 <at> hotmail.com
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  7. Not true. See other post.

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    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    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
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
     
  8. I disagree. See other post.
     
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