Nice job capturing the data *exactly* at 3.712V! That makes it difficult for Nissan to try to claim there is no issue.
Nissan's calculation for CVLI is somewhat convoluted, but I'll use their exact terminology so that OP can share it directly with the dealer in terms that should be familiar from the service manual.
2011 Nissan LEAF Service Manual Revision: 2011 April - Page EVB65 wrote:CELL VOLTAGE LOSS INSPECTION
The cell voltage loss inspection is performed is performed to identify cells that the cell voltage is on the decrease (although not judged a malfunction in DTC) and this may lead to a malfunction, if left stand.
This inspection identifies a cell voltage which is standard value or less when the minimum cell voltage is 3,712mV or less.
A module including a cell voltage identified by this inspection must be replaced with a new one to prevent malfunction.
Skipping section explaining how to do this with CONSULT doing all the calculations.
2011 Nissan LEAF Service Manual Revision: 2011 April - Page EVB66 wrote:CHECKING CELL VOLTAGE LOSS WITHOUT USING "WORK SUPPORT" OF CONSULT
1. PERFORM CELL VOLTAGE LOSS INSPECTION
a. Select "DATA MONITOR" OF "HV BAT."
b. Check "MINIMUM CELL VOLTAGE."
Is "MINIMUM CELL VOLTAGE" 3,712 mV or less?
YES >> GO TO 3.
NO >> GO TO 2.
You are using LeafSpy instead of CONSULT and your MINIMUM CELL VOLTAGE is *exactly* 3,712 mV, so I will not type step 2 showing how to lower the voltage using the heater.
2011 Nissan LEAF Service Manual Revision: 2011 April - Page EVB67 wrote:3. CALCULATE CELL VOLTAGE LOSS JUDGEMENT VALUE
1. Check "DATA MONITOR" and record "TOTAL BATTERY VOLTAGE" and "MAXIMUM CELL VOLTAGE"
2. Calculate cell voltage loss judgment value.
Cell voltage loss judgment value = (2.5 x A - 0.144 x B) / 96
A = "TOTAL BATTERY VOLTAGE" (V)
B = "MAXIMUM CELL VOLTAGE" (mV)
The above equation of cell voltage loss judgment value is the simplified version of the following equation.
1. Calculate the average value of cell voltage by dividing "TOTAL BATTERY VOLTAGE" by 96 (the number of cells)
Average cell voltage = "TOTAL BATTERY VOLTAGE" / 96
Of course, LeafSpy gave you this value directly:
2011 Nissan LEAF Service Manual Revision: 2011 April - Page EVB67 wrote:2. Calculate cell voltage loss judgment value.
Cell voltage loss judgment value = Average cell voltage - ("MAXIMUM CELL VOLTAGE - Average cell voltage) x 1.5
From LeafSpy, we get:
Cell voltage loss judgment value = 3.851V - (3.861V - 3.851V) x 1.5 = 3.836V
2011 Nissan LEAF Service Manual Revision: 2011 April - Page EVB67 wrote: >> GO TO 4.
4. JUDGE CELL OF VOLTAGE LOSS
a. Record "CELL VOLTAGE 1-96" with "DATA MONITOR".
b. Check to see if there is "CELL VOLTAGE" which is less than or equal to the judgment value.
OK: Cell voltage loss judgment value < CELL VOLTAGE 1 - 96
NG: Cell voltage loss judgment value > CELL VOLTAGE 1 - 96
Is there a cell voltage which is the judgment value or less?
YES >> Replace module including cell voltage the judgment value or less. Refer to [EVB-153, "Exploded View"
NO >> INSPECTION END
is significantly higher than the voltage of your cell-pair 4, which is 3.712V
. This is the clearest case of a failure of this test that I have seen. Since this is a new car, my opinion is that your cell-pair 4 has a manufacturing defect of some sort and needs to be replaced. (I have had a few occasions when I have had a cell fail this test, but the failure was much more marginal and was simply due to cell imbalance and later the issues corrected themselves, so I have not reported any issue to my dealer. In your case, the test was done in the optimum condition and one cell is clearly far below the rest of the pack.)
I have posted information in this thread
which explains which cell-pairs are located in which modules and where they are located in the LEAF's battery. Basically, cell-pair 4 is in module MD2, which is located in the rear stack under the back seat, second from the right side of the car.
If you still have the option, I would recommend returning the car. If not, then it seems clear Nissan should replace the failed module under the terms of the warranty. Their own service manual says:
2011 Nissan LEAF Service Manual Revision: 2011 April - Page EVB66 wrote:A module including a cell voltage identified by this inspection must be replaced with a new one to prevent malfunction.