Thread: New Product ESR / IR Meter fo Lipos
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Old Oct 29, 2010, 02:38 PM
Wayne Giles is offline
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Quote:
Originally Posted by rick.benjamin View Post
Polyquest 2200mAh 3S, Oct 2005
Search wire inserted
Pack voltage 12.00
cell voltage 4.02 37.12megohms
cell voltage 4.00 37.12
cell voltage 3.98 37.08
Rick,

Those cell IRs still look suspicious. They look high for a pack of that size at normal temperatures and unusually well matched. I see it is an old pack so would expect the IRs to be drifting apart, even if they were well matched to start with. If you flew a pack with those figure it would be pretty weak; with a total of 110milliohms, 20A would drop the volts by 2.2v until it heated up which would give very poor performance.
Could you post a few results from other packs and also the IR of the pack as well as the cells as this gives a cross reference check. There should be a difference of 6 -8 milliohms between the sum of the "Cell" readings and the "Pack" reading.
This difference is the resistance of the connector + leads + terminations.

Wayne
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