HOLY SHIRT SLEEVES! I too was under the impression that LeafSpy would assist in identifying good batteries. Now apparently there is nothing to protect people when purchasing a used Leaf. I think I might just re-evaluate and tell everyone to avoid Nissan Leafs like the plague. Good job Nissan. If anyone had a shred of compassion left for you, I think it just evaporated. Given their history, I doubt that I will even recommend Leaf 2.AntronX said:Here is SOH (top) and Hx chart. They do appear to follow Ah curve.SageBrush said:So much for having an easy way to identify resets. Does the SOH and Ahr drop in tandem to their pre-reset values ?
(sorry for messy chart)
Leafspy is not a solution to identify resets. It is good to take a more detailed view at the battery SOH instead of looking at battery bars on the dash. But with common sense it may be deduced that, for example, 2014 car that lived in hot climate and with 20K miles on the clock, will not have 96% SOH and is likely been tampered with. One thing did not get reset was L1 L2 L3 charge counters. That may be a clue that in absence of recent battery replacement, it is not likely that a car with 203 L3 and 1600 L1/L2 charges will have 96% SOH or 62Ah battery stats.
Edit: Here is Leafspy screenshots before and after reset:
bmk789: I actually just got it back from the dealer a couple days ago. Nissan decided to cover the cost of the battery, my cost for the battery replacement was about $850. Whole process took about a month. My experience with the dealer wasn't great by any means but overall I'm just happy I got a new battery for $850. If you have any other questions feel free to ask!
http://www.nissan-techinfo.com/Home.aspx has a Purchase link that points to http://www.nissantechmate.com/.AntronX said:cwerdna said:Woah. Re: the reset, why?...
The owner had a rugged tablet looking handheld diagnostic computer that plugged in to diag port on the Leaf. Seller went through scanning and clearing any DTCs that it could find in front of me. We got to battery section and battery health data and before I realized what it was, the seller tapped on battery reset as if was another DTC clear dialog. I did not react in time to stop it. Luckily I pulled battery data before reset with my Leafspy and screen saved it. I forgot to take a picture of the diagnostic computer that was used. It did look fairly expensive. I could try to contact the seller again to ask what computer it was.
Pretty sure it was Autel MaxiSys Pro (MS908 Pro) based on how I remember it looked like.cwerdna said:...Handheld would be unusual but not 100% surprising, if it's an unauthorized tool.
My car has 20500 miles on it now and it clearly had some manipulation of the Ah reading before I bought it. My curve looks very similar to the first part of AntronX's curve which means that I could have months of continual "virtual" degradation.LeftieBiker said:One thing that is unusual about your car is the mileage. 75,000 miles is more than we've seen with other resets, and I have to hope that this factor makes a difference, somehow. Or maybe it takes multiple resets, over time, to "unlock" the AH reading and make it vulnerable to being reset.
LeftieBiker said:Is it possible your car had more than one reset?
kingjamez said:LeftieBiker said:Is it possible your car had more than one reset?
Do you mean for miles too? Unlikely, I saw the carfax report and everything looked good (except that it came from Georgia, like all off-lease cars seem to recently).
-Jim
AntronX said:Leafspy is not a solution to identify resets. It is good to take a more detailed view at the battery SOH instead of looking at battery bars on the dash. But with common sense it may be deduced that, for example, 2014 car that lived in hot climate and with 20K miles on the clock, will not have 96% SOH and is likely been tampered with. One thing did not get reset was L1 L2 L3 charge counters. That may be a clue that in absence of recent battery replacement, it is not likely that a car with 203 L3 and 1600 L1/L2 charges will have 96% SOH or 62Ah battery stats.
Edit: Here is Leafspy screenshots before and after reset:
After battery stats data reset, everything gets set to as if battery cells were brand new. So the data becomes: 66 Ah, 100% SOH, 100% Hx regardless of charge state. Leafspy just displays what BMS is reporting after reset
LeftieBiker said:Before we toss LeafSpy, I think we should try to figure out what's going on in this one case, and see how widely it applies. This doesn't explain the cases where the BMS was reset, but the AH didn't revert to the brand-new reading.
baustin said:Another question to consider is are there more than one type of BMS reset available? The BMS resets that have been reported in the past are the same as what happens with some Software Updates to the Leaf. The other data is reset, but the Ahr reading has stayed the same, leading to that as the relied upon figure to determine if a reset was done. It is possible that there is also a 'factory default' type of reset available that resets all the BMS data to the same as when the pack was built. The BMS reset used to be associated with unscrupulous dealers. Maybe there are now more 'ignorant' dealers that are just doing as the one user reported, and going down the list resetting everything available.
My car is 2011SL that had new battery installed in 08/2014 at 60K miles. The seller drove it for 15K miles and sold it to me in 05/2016. The replacement battery is 295B0-3NF9E which I believe is a 2015 "lizard" battery. I wonder if the new 2015 battery BMS could have a different reset behavior compared to original 2011-2014 pre-lizard batteries?LeftieBiker said:One thing that is unusual about your car is the mileage. 75,000 miles is more than we've seen with other resets, and I have to hope that this factor makes a difference, somehow. Or maybe it takes multiple resets, over time, to "unlock" the AH reading and make it vulnerable to being reset.
Enter your email address to join: