Yesterday I went in for 1-year check-up. I requested a battery cell loss report. The service rep told me they called Nissan, Nissan checked my Vin number, (-2500), and they told him that some LEAFs, including mine, did
not support the battery cell analysis. Has anyone else been told that ? My report card was all 5-stars.
Update on my capacity loss. With recent cooler over-night minimum temperatures, mild day-time temperature, I was hoping for some better scores, but I was disappointed to see a little further loss (some temps missing):
Date, Temp F, %goal, gids, gids%, voltage
5-26, 66, 100%, 270, 96.0, 394.0V
5-30, --, 80%, 225, 80.0, 387.5V
6-2, --, 80%, 223, 79.3, 387.5V
6-3, 67, 80%, 223, 79.3, 387.5V
6-4, 62, 80%, 222, 79.0, 388.0V
6-5, 65, 100%, 267, 95.0, 392.5V
6-6, 59, 80%, 223, 79.3, 388.0V
The lower 100% voltage on 6-5 indicates some cell imbalance, so perhaps the drop of 3 more gids from 5-26 100% charge is not all permanent.
On pg 43 of this thread Ticktock reports:
I took mine in 3 months ago and got them to run the cell pair test. Despite confirming the loss in capacity/range, all the cells came back in good shape (only 60mV difference between the highest and the lowest cell pair).
I claim 60mv actually is significant. Assume the 96 cell-pairs are uniformly distributed across this 60mv span from lowest to highest. The total loss in maximum pack voltage should be:
96*(60mv)/2 = 2.88V
My data indicates there is about 25 gids of capacity in the top 3 volts of total pack voltage, which is 2 kWhs. This is only the capacity loss due to the measured variation. All the cells, including the most healthy, have additional loss to account for your total loss.
If, instead, all the voltage deviation (highest voltage is weakest cell when fully charged) was concentrated in just a couple of cell pairs, I would think you would be on your way to having a case for partial cell replacement.