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Testing batteries

Discussion in 'Electronic Basics' started by js5895, Mar 27, 2005.

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  1. js5895

    js5895 Guest

    Hi,

    Can I test AAA, AA, C, etc. batteries to see if they're good, like car
    batteries.
    Check the voltage and get for instance, 12.8v(100%), 12.5v(50%), 11.8v(10%)
    If so, do I put a load on it while testing? Like a light bulb.

    Thanks.
     
  2. Tom Biasi

    Tom Biasi Guest

    There is a specified load and a corresponding acceptable voltage drop for
    each battery size and type.
    Get the specs or buy a battery tester for about 5 bucks.
    Tom
     
  3. Tom Biasi

    Tom Biasi Guest

    I didn't see anything in those links to help you.
    You need to know the load that the manufacturer wants for the load test and
    the voltage curve that will result.
    You could put 100 Ohms or so across your meter leads and see if the battery
    drops much below the rated voltage, with some practice you will develop a
    sense of when your batteries are starting to fail.
    This is crude but not much worse than the cheap testers like this one
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=4943228133&category=10363
    Regards,
    Tom
     
  4. mike

    mike Guest

    Curiosity is good. You should do whatever it takes to satisfy it.
    But, the only load that makes sense in testing batteries is the load
    that you are gonna apply. Batteries destined for a digital camera
    need to be tested at high load. But that would give pessimistic readings
    if you were gonna use the batteries in a clock.

    For a quick check,
    Stick 'em in a flashlight and see how dim it is.

    Used to be able to buy batteries with a built-in tester. Peel that off
    and use it. Can't find any in my battery box. Not sure they make 'em
    any more. Expect that function cost way more than people were willing
    to pay.
    mike


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