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Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 1:50 am
by kovadam
So it seems I will be the first one, who gets a new battery pack after 4-5 years for the 40kWh Leaf.

The SOH drop did not stopped, as written above, it started to decline in bigger steps from 96.91% in just 4 days. Now I'm at 95.71%. The last 0.07% happed in one hour standing the car in the parking lot (wake up with 95.78% SOH and 100% SOC then drove the kids to school, etc, I drove about 30km, then left the car for 1 hour parking, then the SOH was 95.71%) . The temperature is currently 8°C here, so it is not the heat (battery pack between 16 and 20°C), it's raining, and quite cold.

I did not QC-d the car at least for 2 weeks, and then also only for 10-15 minutes to reach 50-60% SOC. The Hx floats around 114.18-114.20%.

So the car has 13.500km, and is about 6 months old, and already lost over 4% SOH. So 1 year = 8% SOH loss, 2 years, and I get 1 bar capacity loss. Then every year 1 bar capacity minus, so when the car will be 5 years old, I'm down to 66%, and can ask for a warranty replacement.

Seems really bad for me.... :(

Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 1:56 am
by LeftieBiker
It may slow, as mine did. It may not matter in the long run, but a QC session on a cool day or night may bump it up again.

Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 2:27 am
by kovadam
Bump it up? You mean the SOH? Or Hx?

The degradation was never fast, there were 2 times, when I lost 0.5%, but usually it was 0.01% / day or couple of days (like 2-3 days -0.01%). But now, in 4 days I lost more than 1.2%, in quite big chunks, so this started to worry me. I'm curious when I drive home from work, what will be the SOH. Now the car is in a garage, outside about 8-10°C inside may be 15°C. SOC is around 85%, SOH was 95.71% when I parked. Will see and report when I leave the garage.

Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 4:24 am
by LeftieBiker
I mean "bump up the SOH." Although that may not even be possible with the 40kwh Leaf - the BMS may prohibit it. Or not.

Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 6:22 am
by jdcbomb
Im curious to know if there are 18/19 MY that have more than 40,000 mi to see where their SOH is (besides the one in Phoenix that apparently still had 92 pct, but that one I recall was sitting in extreme heat last year and driven hard).

Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 6:29 am
by DaveinOlyWA
Jerryr wrote:Just as a point of reference. My brand 2019 SL Plus w/62 kWh battery, manufacture date 2/19. 46 miles on odometer after driveling it home from dealership.

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So this is not a full charge then.

If you get the chance post the same at full charge.

Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 6:49 am
by WetEV
kovadam wrote:So the car has 13.500km, and is about 6 months old, and already lost over 4% SOH. So 1 year = 8% SOH loss, 2 years, and I get 1 bar capacity loss. Then every year 1 bar capacity minus, so when the car will be 5 years old, I'm down to 66%, and can ask for a warranty replacement.

Seems really bad for me.... :(
The first 5% of capacity is often lost faster than later capacity. Not linear.

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Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 6:55 am
by DaveinOlyWA
In the previous 3 LEAFs, I saw the opposite where it maintained "new" status for probably (don't have specific stats on the 2011) the first 6 months or more. The 2016 went 14 months and over 29,000 miles at 100% SOH and 99.64% of its original ahr

Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 7:06 am
by WetEV
DaveinOlyWA wrote:In the previous 3 LEAFs, I saw the opposite where it maintained "new" status for probably (don't have specific stats on the 2011) the first 6 months or more. The 2016 went 14 months and over 29,000 miles at 100% SOH and 99.64% of its original ahr
Yes, but you do many QCs, which increase the estimated SOH.

Re: The 40KWH Battery Topic

Posted: Tue May 14, 2019 7:08 am
by kovadam
Ok, got the new SOH, its 95.64, 0.07 lower, than 8 hours before... either the BMS is dead, or the battery cells are dead. Since I have issues with epedal regen also, I think the BMS is buggy somewhere. Now I need to wait until it dies so I get a replacement...