What do the cell-pair voltages look like when the pack is 80% and 100% charged?
I finally got around to posting this. At 100%, the bad cell is still obvious and would meet the formula criteria. But from what Cliff posted, the minimum cell voltage is too high for the test to be valid and of course the variation is only a small 27 mV.
I will say that I started looking hard at my battery when I thought that I had a reduced range/battery capacity of about 10-15%. I was just reading over another thread
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In this post djjazy reported that on Leaf Spy, the SOC was recorded as 0.6% SOC and that his battery capacity was 21.5 kWh (what many others report) which perfectly matched the miles driven divided by the average miles/kWh (I assume as reported on the dash).
I have been turtled with 9% SOC showing on my Leaf Spy and on another day with 11% showing on my Leaf Spy. Thus it seems that the bad cell is preventing me from using the bottom 10% of my battery. Also in the screenshot above, at 100%, LeafSpy is reporting 97%. Is this normal? If not, I'm losing another 3% at the top too. Fully charged, I'm at ~282 Gids, and at turtle ~5 Gids.
When I take my total miles driven and divide by the average miles/kWh for the day, I usually get a number like 20 kWh or lower again indicating that the total capacity of the battery is too low. I haven't done many tests from full charge to turtle...because its not good for the car! But I have MANY test from say 80% to 30% and when you extrapolate those cases to 100-turtle the results are comparable.
One other observation seems to clearly indicate some anomaly which is the rate of charge. Below is some typical data while I'm charging my car (not using Leaf Spy, but only the dash readout for %SOC)
Level 2 charging, Seimens Versacharge
Time %SOC minutes/%SOC gained
3:11 71% 1.8
3:23 78% 1.7
3:33 87% 1.1
3:44 94% 1.6
3:48 95% 4.0
Now I know that it slows down as you get close to 100%, so maybe this time it slowed down a bit sooner. But what's with the very high rate of charge in the middle?? There is no way that can happen. I've seen this at other times too. The net result is that I think my car does not charge steadily....or more likely the battery is very non-linear in how it holds charge.
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