Turbo3 wrote:The formula can be found in the 2011 April version of the Leaf Service Manual on page EVB-67.
If there are any other formulas please post them and where you got them from.
The only formula I know about is Judgement = Avg - (max - avg)*1.5 and the min voltage must first be below 3.713 volts. The Leaf must be parked. So you don't make this measurement while the battery is under load.
For this example the numbers are min=3.645, avg=3.673, max=3.690. Filling in the formula gives:
3.673 - (3.690 - 3.673) *1.5 = 3.673 - (0.017)*1.5 = 3.673 - 0.0255 = 3.6475
Because the minimum cell is 3.645 we know at least one cell is judged as bad.
It is possible that after heavy use the battery needs some time to stabilize. So if you leave the battery sit for a few hours and it still reports a bad cell it would have more significance.
You should definitely keep an eye on cell #28.
Does the service manual specify the SOC at which voltage measurements should be taken? Leaf Spy routinely flags at least 5 cells on my pack as bad around VLBW and below, no DTCs. I usually see this after pulling into garage, so it is possible this doesn't occur after the car sits for some time, need to verify. In any case I suspect it is not an actionable situation.