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Alkaline battery testing

Discussion in 'Electronic Repair' started by [email protected], Sep 23, 2005.

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  1. Guest

    From time to time I would like to properly load test different types of
    used alkaline batteries such a AAA AA C D and 9V. Does anyone have the
    load specs on this or perhaps a chart showing what the minimum terminal
    voltages would be under load for new or used batteries of the sizes
    mentioned above. Thanks, Lenny Stein, Barlen Electronics.
     
  2. Guest

    Duracell has charts for their batteries showing voltage over time at
    different drain currents.
    http://www.duracell.com/oem/primary/alkaline/alkaline_manganese_tech.asp
    Other manufacturers may have this data as well.

    Matt Roberds
     
  3. We have had interesting results testing the ESR of batteries using Bob
    Parker's ESR meter kit. I have a chart on:

    http://www.flippers.com/esrkthnt.html#battery

    Perhaps you can make a baseline for your batteries then you have a
    potentially non-destructive process to quickly evaluate batteries
    without loading them down. Or not.

    John :-#)#
    --
    (Please post followups or tech enquires to the newsgroup) John's
    Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
    (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
    www.flippers.com "Old pinballers never die, they
    just flip out."
     
  4. Guest

    So according to the article you can just place the esr meter directly
    across the battery without damaging the meter? What effect will the two
    back to back diodes which I installed for protection have on this??
    Lenny Stein.
     
  5. Andy Cuffe

    Andy Cuffe Guest

    Interesting idea, but I would think you would need to use a DC
    blocking cap. A large non-polar cap would work.
    Andy Cuffe

    <-- Use this address until 12/31/2005

    <-- Use this address after 12/31/2005
     
  6. Ah, well, you will need to temporarily REMOVE the clipping
    diodes...perhaps a way to switch them in and out of circuit depending
    on the function you are testing (in = caps, out = batteries?).

    John :-#)#

    --
    (Please post followups or tech enquires to the newsgroup) John's
    Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
    (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
    www.flippers.com "Old pinballers never die, they
    just flip out."
     
  7. The kit does have a blocking cap, 50VDC rated. It is when the voltage
    goes much over that the the kit can be damaged. Hence the notice on the
    front to discharge caps first!

    John :-#)#
    --
    (Please post followups or tech enquires to the newsgroup) John's
    Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
    (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
    www.flippers.com "Old pinballers never die, they
    just flip out."
     
  8. Guest

    That would seem to beg the question if one were simply to replace that
    cap with say one with a 450V working voltage, would the diodes then be
    unnecessary? Lenny
     
  9. Bob Shuman

    Bob Shuman Guest

    At minimum, you would need to compensate for the ESR of the new 450V cap you
    introduced in series into the test leads in order to still get an accurate
    reading. The diode clamps sounds like a more effective way to protect the
    ESR meter to me since test voltage is kept below the bias voltage so they
    don't affect the calculated ESR.

    Bob
     
  10. I suspect one could put the blocking diodes AFTER the capacitor, thus
    protecting the unit from surges.
    If you are going to use the meter to check batteries then leave the
    protcetion back-to-back diodes off the input lugs, otherwise install
    them or be very sure the cap is discharged before attemtping to read.

    Bob Parker put a lot of thought into designing this kit and I hazard to
    recommend any changes from that design.

    Thanks Bob (as always).

    John :-#)#
    --
    (Please post followups or tech enquires to the newsgroup) John's
    Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
    (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
    www.flippers.com "Old pinballers never die, they
    just flip out."
     
  11. Guest

    I would hate to have a "switched" arrangement for the diodes. I'm
    admittedly quite careless sometimes, and Invariably I would forget to
    switch them back in after using the meter to measure a battery and wind
    up blowing the micro on a charged 250V cap. Probe tips are cheap. Those
    diodes have saved the micro as well as my ass on more than one
    occaision. Lenny.
     
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