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Author Topic: ESC Batery Cell Count Mismatch  (Read 329 times)

Online Ken Culbertson

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ESC Batery Cell Count Mismatch
« on: August 12, 2025, 07:02:59 AM »
What is the outcome of having an ESC that has a fixed cell count by parameter (Jeti Spin Pro 44) and using a larger cell count battery?  That was my only ESC that did not auto detect and I forgot when I switched batteries from a 5s Lipo to a 6s Li-Ion.  I was doing fine with the 5s Lipo but using more mah than I liked.  Typically 2200-2300 on a 2800 pack.  Switching to 6s seemed logical but the usage went UP and I was barely able to complete a pattern on one flight and ran into the LV cutoff in the overhead 8 on the next (fortunately I had it set to soft).  Autopsy reveled my mistake, if it was in fact a mistake that mattered.  I am used to the .1 or .2 drop in lap time from the Li-Ion but this should not have happened.  Can anyone fill me in on how an ESC reacts when it gets a higher voltage than expected?

Thank - Ken
AMA 15382
If it is not broke you are not trying hard enough.
USAF 1968-1974 TAC

Online spare_parts

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Re: ESC Batery Cell Count Mismatch
« Reply #1 on: August 12, 2025, 08:07:54 AM »
It will discharge the battery to the 5S cut off voltage. Other than that, it knows exactly what the voltage is, so it's not unexpected. Why the battery didn't perform as expected shouldn't be related to this. If nothing else changed(prop, rpm, ...) it would be surprising it used that much more energy, but we know there are many factors.
Greg

Online Ken Culbertson

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Re: ESC Batery Cell Count Mismatch
« Reply #2 on: August 12, 2025, 12:47:07 PM »
After correcting the ESC the battery performed normally.  No clue why it went the way it did.  I would not have expected it to be drawing more current at first but it was.  Today a fresh 6s 2800 Li-Ion battery fully charged gave me a perfect (motor wise) pattern, three unwind loops and 6 extra laps and landed with 3.51 volts per cell.  Boost and overhead tension the same in the RWO and the OH8.  Life is good.  Now to attack my twin's wierdness.

Ken
AMA 15382
If it is not broke you are not trying hard enough.
USAF 1968-1974 TAC


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