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Old 06-06-2002, 12:03 AM   #1
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Arrow some battery tech

i know everything in the world has been posted on this subject, but i'd just like a few questions answered.

i've been logging all the charge info from my mil pro with every charge. i've also graphed voltage vs. time curves during discharge on a lightbulb assembly. i know that the resistance willl change with temperature, but keeping most things constant, here's what i've noticed:

- the batteries that peak at high voltage when charging seem to run at a low average voltage. these same batteries seem to get hotter upon discharge.

is this a direct result of a high ir? resistance yields heat?

without being able to measure ir, i'm trying to make some generalizations so that i can determine the worth of my batteries on the bench using equipment i already own.

help!


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Old 06-06-2002, 01:48 AM   #2
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Yes, higher internal resistance will result in a higher peak voltage, and lower average voltage and more heat during the discharge.

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Old 06-06-2002, 02:09 AM   #3
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thanks trips, you're the man. anything else that is useful to know about this stuff?

how about doing soldering work when the batteries are fully charged? will the iron heat the cell faster if it is charged?
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Old 06-06-2002, 04:03 PM   #4
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No, not really, though if the cells' temperature is up anyway(as normally happens when a pack has peaked) it might seem like it heats up faster, but not by much......
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Old 06-06-2002, 05:06 PM   #5
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Soldering charged batteries also makes it more likely to short out something and cause some real damage. If they are discharged and you short them there usually isn't any damage done if the short if removed relatively soon.
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Old 06-07-2002, 12:24 AM   #6
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thanks fellas.
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