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Old Feb 05, 2013, 04:35 PM
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FlyingW's Avatar
Long Valley, NJ, USA
Joined Dec 2001
1,691 Posts
Question
A123 Pack and PL6 Internal Resistance Calculation

FMA Direct,

When I charge a 3-cell A123 2300mah pack after a full discharge, the PL6 calculates an IR of about 9 to 11 mohms per cell.

When I charge the same pack after a short flight and a partial discharge, the PL6 calculates an IR of about 11-13 mohms per cell.

Why does it comes up different IR values depending on the state of discharge?

Thanks,

Paul
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Old Feb 05, 2013, 05:08 PM
Registered User
Seattle
Joined Sep 2007
2,145 Posts
Heat? The longer discharge may be warming the pack, which will produce a lower IR.
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Old Feb 07, 2013, 08:44 PM
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FlyingW's Avatar
Long Valley, NJ, USA
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Thanks Gregor99,

Paul
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