Marktm wrote:Depleted battery totally today with mix of highway, suburban, sitting with drive on. The final SOC was 2.4% with 4 GIDS. Full power was 80,000 watts right up until turtle. When turtle kicked in, the max was around 7000 watts (LeafSpy battery bar readings). At present L1 charging (for the next 12 hours of so!).
The battery values at shutdown:
I am going to re-iterate that it looks like you might have a couple slightly weak cells, but nothing I would call defective. This test really shows the car is running fairly well and the BMS is balancing out the differences. My 7-bar battery had significantly worse values than this, although it was a canary pack and heavily degraded.
The first LeafSpy you linked showed an average cell voltage of 3.45V, whereas the new graph shows a voltage of 3.1V. While this sounds like a huge difference, it's actually very small for the 24 kWh cells. See the SECOND discharge curve on this page: (the top discharge curve is the new 40 kWh cells):
https://pushevs.com/2018/01/29/2018-nis ... eal-specs/
The second curve shows the voltage falloff occurs at around 3.6V (use the top light blue line, as you were presumably not driving while getting the LeafSpy screenshot, which means you should be using the 1/3C line). If you look at this graph, you can see the difference between 3.45V and 3.1V is less than 1 Ah. Each cell holds 30 Ah, so a 1Ah difference is very small.
We know that the central battery cells in the Leaf pack heat up faster and stay hot longer, so they will wear out faster. This is amplified in hot environments, like yours. It is normal as the pack ages to have the center cells get slightly weaker than the outside ones and show small differences like this.
Honestly, I don't think you have a defect.
Marktm wrote:Yes, now the decisions about how to make that happen quicker vrs extending battery life - within the confines of acceptable usage and care. I believe the "defective" is 10 years. However, a replacement "Lizard" start date might be in question??
Your car looks fine to me. I would not try to stress it to bring out the "defect", as I don't think you have one. You're likely to just wear out your battery more quickly.
Are you getting the range you would expect out of this pack for your driving conditions? Are there any other symptoms, or is the only concern that the car is showing voltage differences and turtled 2-3% sooner than it should?