Thread: New Product ESR / IR Meter fo Lipos
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Old Sep 02, 2013, 02:01 AM
Wayne Giles is offline
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Rugby, UK
Joined Feb 2007
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Mike,

The reason for these wild readings is that the unit needs a minimum voltage of 6.6 - 6.8V supply from the lipo under test DURING THE LOAD PULSE.
The voltage of a discharged 2S pack will collapse to below this voltage level during the pulse so that the reading becomes meaningless.
The reason that it seems OK after the pack cooled would be because the voltage will have recovered to the point where it would remain >6.8V during the pulse.

Always read a pack when it is charged. Even if it is a 3S pack or larger so that you get a correct reading, it may be that you are looking at a discharged cell, so that the reading is still meaningless.

If the meter has the single cell modification, it is better to use an auxillary supply for testing smaller or partially discharged 2S packs which ensures valid readings.

Wayne
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