Does your LEAF have a 30 kWh battery? I assume so since you are posting in this thread (and since it lost a bar already with those numbers.VAB5 wrote:Thoughts?
RegGuheert wrote:Does your LEAF have a 30 kWh battery? I assume so since you are posting in this thread (and since it lost a bar already with those numbers.VAB5 wrote:Thoughts?
It seems clear to me that your BMS was reset prior to the vehicle being sold to you. Still, it's pretty amazing how much capacity has been lost already. It seems the NMC chemistry loses capacity even faster than the older LEAF battery chemistry.
It is not routine. There are some service procedures which call for a reset, such as replacing the battery pack or the BMS. The command is called "GRADUAL CAPACITY LOSS DATA CLEAR" and can be done by Nissan dealers.VAB5 wrote:So, is BMS reset as a matter of routine, or would someone reset it to hide something? In other words, why would a BMS be reset? And who can reset it?
My guess is that your dealer reset the BMS to make your LEAF appear to have more capacity than it really did at the time of your purchase.RegGuheert on June 19, 2012 wrote:One more thought on this: I'm wondering if the LI-ION GRADUAL CAPACITY LOSS DATA CLEAR command discussed on page EVC-107 of the Nissan LEAF service manual resets lost capacity bars if it is executed on a car with an older battery.
If so, then I suspect some unscrupulous sellers will reset that just as some do with odometers today. The manual says it is only to be executed in the case of the installation of a new battery or a new battery controller, but that won't stop some people.
RegGuheert wrote:My guess is that your dealer reset the BMS to make your LEAF appear to have more capacity than it really did at the time of your purchase.
I don't know the answer to your questions, but I suspect the car keeps a record of when the BMS was last reset. If so, you might be able to show that it was done while in the possession of the dealership.VAB5 wrote:Is there any way to prove that?RegGuheert wrote:My guess is that your dealer reset the BMS to make your LEAF appear to have more capacity than it really did at the time of your purchase.
Would LeafSpy provide evidence?
berclese wrote:samrovner wrote:berclese wrote:
UPDATE: Of course, Nissan says my 66% SOH battery is doing great at one year of service. The battery information sheet is worthless as it just rates your use of charging and driving usage, presumably from the Nissan Connect data. It also shows the bars left in a graph, nothing we don't already know. No data on SOH, kWh or projected range.
The service rep said 20-25% capacity loss in the first year is average. I hope the loss is going to slow this year. This car is going to become worthless to me if the range gets much worse.
You and I are in the same boat, and I was hoping you were going to have better news today. I'm in Phoenix too, and this is my second LEAF. My 2013 SV didn't degrade like this at all. I agree with you about the car becoming worthless, and can't imagine what the range will be like when I finally lose my 4th bar. I read an article last night about contacting Nissan's Customer Support to start documenting this early, just to avoid headaches when it finally does qualify for replacement. I plan on calling them later today or tomorrow. Have you reached out to them yet?
I am under the suspicion that Nissan may have moved the SOH/capacity bar relationship for the 30 kWh battery. My car will likely drop it's second bar very soon. Have you taken your car in for the yearly battery check? That may help you in the long run (no pun intended). I have not contacted customer service. Please let us know how that goes.