I got the BMS software update last week. Mine's a 2017 with 13k miles & 11/16 build.
Before:
11 bars
SOH=83.13%
AHr=66.07
Hx=77.59%
After:
12 bars
SOH=92.24%
Ahr=73.31
Hx=77.73%
Range appears to be about the same as it was when the car was new. Regen is better now so that might help mileage slightly.jbuntz wrote:I know range is a touchy subject, but are you getting a feel for range with the new battery?johnlocke wrote:Update on new battery after one month. 82.09 AH 363 GID's, SOH 103.20%, Hx 96.82%. 46966 mi. with just over 2000 mi on the new battery.
I had the software update done in late June but it appears that it was already done when the battery was changed. I haven't needed to to do a DCFC yet so I can't comment on charging rates with the new battery. Only real difference I see is that some regen is available at all times. I get one circle of regen available by the time I pull out of the driveway and LeafSpy says it's working. 3 circles by the time I'm down to 97% and all 4 by 94-95% down.
Battery health has actually improved slightly over the last month. I suspect that is due to the BMS learning the new battery. I expect it to take at least a year to see if the software patch actually does anything. I'll keep posting periodically for everyone's benefit.
When we consider the warranty was 8 years and 4 bars were being lost at 2 years something was obviously wrong. It seems a fact that the BMS was incorrectly reporting capacity on a number of cars. Other capacity testing methods such as charging energy from flat and dynamometer run down confirmed some cars under reporting.waikalua wrote:I’m beyond skeptical about this ‘software update.’ Six months ago Nissan was replacing batteries on cars with the same degradation pattern. Suddenly they eliminate a multi-million dollar physical liability with an easy software fix?
Since battery capacity is a MAJOR factor in the resale value of an EV, how is this different from odometer tampering?
There's a lot of experts on this forum, is this for real?
Re-programming the BMS has the unintended consequence of resetting capacity bars and other parameters. This will be temporary, probably settle down after a month. Expect to lose a bar or two again.waikalua wrote:
Since battery capacity is a MAJOR factor in the resale value of an EV, how is this different from odometer tampering?
I think the problem is Nissan did not disclose how the bars are calculated for warranty purposes. If they had then it would be easy to prove if the bms was reporting incorrectly.JPWhite wrote:Re-programming the BMS has the unintended consequence of resetting capacity bars and other parameters. This will be temporary, probably settle down after a month. Expect to lose a bar or two again.waikalua wrote:
Since battery capacity is a MAJOR factor in the resale value of an EV, how is this different from odometer tampering?
Odometer tampering is deceptive, intentional and permanent. This isn't permanent. Nissan's goal is not to disguise true battery degradation and it will settle down within a reasonably short period of time.
EV's (and modern cars in general) are like computers on wheels. When you call tech support one of the early troubleshooting steps will be to upgrade firmware to a current revision, it sets a baseline for troubleshooting. If that doesn't help then additional actions will be taken. This is no different, Nisan need to get your firmware to a current and known state and can act accordingly thereafter.
It can be frustrating to see what apears to be a valid warranty claim evaporate, but another month and you will know the true state of your battery and warranty eligibility.
Agree that Nissan have bungled the handling of this much the same as they bungled the 2011/12 battery issues.jbuntz wrote:JPWhite wrote:
Since they did not disclose then I think they should not change the formula mid stream. At least they should honor the warranty as written.
Again, isn't interesting that the Hx shows no improvement after the firmware "update"? Both Hx and Ahrs are highly correlatedchirpyboy wrote:I got the BMS software update last week. Mine's a 2017 with 13k miles & 11/16 build.
Before:
11 bars
SOH=83.13%
AHr=66.07
Hx=77.59%
After:
12 bars
SOH=92.24%
Ahr=73.31
Hx=77.73%
I think the simple answer is, "We don't know, yet."waikalua wrote:There's a lot of experts on this forum, is this for real?