Post Your Battery Degradation Results

[dgpcolorado]

...
Today 255 Gids at full 94.23% SOC 60.7128Ah 90.86%h

You seem to be catching up with me: I was at 60.4 Ah this morning, 12,300 miles, build date October 2011 (had P3227 in early July).

I wish I had your Leaf DD last summer so I would have known the battery temperature: I could have parked outside at night in summer and kept the temperature in the 15ºC to 18ºC range (the temperature usually gets to the 50s at night here in the mountains, sometimes even 40s). I bet my capacity would be somewhat higher if I had known to do that — the temp bars on the dash are almost useless!

 

[GregH]

Looks like I can count Gids with 8 bits now :/

Have you had the P3227 update?

not yet.

 

[sparky]

My Gid data for the past 450 days. I'm at about 32 months; ~26k miles; SoCal.
Blue is 100% charge; Red is 80%.
Looks like I'm down almost 10% with a pretty linear 10 Gids per year trend. Not sure if I'll get through next summer with 12 bars but this summer looks pretty secure. So, ~3% degradation per year seems pretty "normal". I think for SoCal, my LEAF sees cooler average temps than many here. At home, it's parked outside in the shade and sits in an open-air parking structure during work-days. Time for me to do my Home-LAX-Home range test I guess.

 

[bradbissell]

2013 SV Built 3/13 Delivered 3/31/13

Date-------Ahr------%CAP----%SOC----Health----- GIDS----V Max---mv Delta---Max Batt Temp F---- Total Miles
6/24/13---66.850---102.363--97.100----------------------4.135----10.000-----80.000
8/12/13---65.810---100.320--96.800----100.760----283----4.128----12.000-----68.900------------5443

Wow. What kind of mileage estimate does the GOM report? Thats awesome. I'm sitting at 92% cap in my 2013 SV built 3/13. Would be nice to have another 10% capacity. Our GOM reports about 98 miles on a 100% charge. Does yours report 110 miles? We average 4.3mi/kwh.

I'm averaging 4.7mi/kwh. I usually ignore the GOM, but it reads 100 on a 100% charge. I do get about 1 real mile per %SOC these days.

 

[RegGuheert]

My Gid data for the past 450 days. I'm at about 32 months; ~26k miles; SoCal.

That's very good data, sparky. And it is actually somewhat encouraging! Thanks!

 

[TomT]

Way better than what I have. Your red (80%) is almost equal to my blue (100%)... I'm down about 20% in 36K miles and 29 months in the same general geographical area...

My Gid data for the past 450 days. I'm at about 32 months; ~26k miles; SoCal.

That's very good data, sparky. And it is actually somewhat encouraging! Thanks!

 

[opencar]

My Gid data for the past 450 days. I'm at about 32 months; ~26k miles; SoCal.
Blue is 100% charge; Red is 80%.
Looks like I'm down almost 10% with a pretty linear 10 Gids per year trend. Not sure if I'll get through next summer with 12 bars but this summer looks pretty secure. So, ~3% degradation per year seems pretty "normal". I think for SoCal, my LEAF sees cooler average temps than many here. At home, it's parked outside in the shade and sits in an open-air parking structure during work-days. Time for me to do my Home-LAX-Home range test I guess.

glad I dug up this thread. i reported the following in another thread:
1st bar lost @ 55.29 Ahr, 23K mi, Coastal San Diego. has anyone posted Ahr for the 2nd bar loss?

 

[IraqiInvaderGnr]

Ahr 67.11 Gids 283 as of 8-31-13. Yesterday was the first day the Ahr dropped off from 67.36. 8,400 miles on the car and health is 102.31%

 

[GregH]

Ahr 67.11 Gids 283 as of 8-31-13. Yesterday was the first day the Ahr dropped off from 67.36. 8,400 miles on the car and health is 102.31%

Interesting data point, thanks! I had a 2013 rental for 3 weeks and the Ahr capacity never budged from 67.3620 and it always charged to 284 Gids. In that time I saw the health move around from 111% to 108% but always wondered how low it would have to go before the Ahr dropped off... meanwhile my trusty 7 month old 2012 which has been toasty with battery temps averaging low 30s (C) but touching 7 bars (38C?) twice has dropped under 60Ah and less than 90% health
So from your data I wonder if we could conclude that 2013 rental was over 68Ah? hmm.. must be nice.

 

[occ]

2011 LEAF, purchased 6/17/11. 20680 miles. Got the p3227 update yesterday:

Before p3227 update: Ahr= 51.12 (77.16%) Health=72.54%
After p3227 update: Ahr= 56.42 (85.16%) Health=72.44%

(as reported by Leaf Battery App, v. 0.25n2)

We're in Tustin, CA (Southern Cal). Seems like ours is degrading quicker than other LEAFs in the general area.

Does anyone know which measure Nissan Battery Warranty uses?

 

[mwalsh]

Does anyone know which measure Nissan Battery Warranty uses?

Four capacity bars gone. So you need to be at 8 or fewer left within the 5 years/60,000 miles.

 

[opencar]

2011 LEAF, purchased 6/17/11. 20680 miles. Got the p3227 update yesterday:

Before p3227 update: Ahr= 51.12 (77.16%) Health=72.54%
After p3227 update: Ahr= 56.42 (85.16%) Health=72.44%

(as reported by Leaf Battery App, v. 0.25n2)

We're in Tustin, CA (Southern Cal). Seems like ours is degrading quicker than other LEAFs in the general area.

Does anyone know which measure Nissan Battery Warranty uses?

How many capacity bars were missing pre-update? i assume your bar display did not change post update, did it?

 

[occ]

Does anyone know which measure Nissan Battery Warranty uses?

Four capacity bars gone. So you need to be at 8 or fewer left within the 5 years/60,000 miles.

ok thnx. I just lost the 2nd bar last week. If it's linear, I will lose that 4th in two yrs, which would be 4 yrs and around 40K miles.

 

[occ]

2011 LEAF, purchased 6/17/11. 20680 miles. Got the p3227 update yesterday:

Before p3227 update: Ahr= 51.12 (77.16%) Health=72.54%
After p3227 update: Ahr= 56.42 (85.16%) Health=72.44%

(as reported by Leaf Battery App, v. 0.25n2)

We're in Tustin, CA (Southern Cal). Seems like ours is degrading quicker than other LEAFs in the general area.

Does anyone know which measure Nissan Battery Warranty uses?

How many capacity bars were missing pre-update? i assume your bar display did not change post update, did it?

No the bars display did not change. I lost that 2nd bar last week, then decided to do the update yesterday, and after the update, it was still showing 10 capacity bars. Still two down after update.

 

[GregH]

Before p3227 update: Ahr= 51.12 (77.16%) Health=72.54%
After p3227 update: Ahr= 56.42 (85.16%) Health=72.44%

Does anyone know which measure Nissan Battery Warranty uses?

Hopefully Ahr capacity
Interesting that the health was more or less unchanged.. based on other posts I'd seen it looked like it moved a lot after the update.

 

[occ]

Before p3227 update: Ahr= 51.12 (77.16%) Health=72.54%
After p3227 update: Ahr= 56.42 (85.16%) Health=72.44%

Does anyone know which measure Nissan Battery Warranty uses?

Hopefully Ahr capacity
Interesting that the health was more or less unchanged.. based on other posts I'd seen it looked like it moved a lot after the update.

Yup, I noticed that too... I made sure I took the readings right before and after the update, right at the dealer, 1hr 15min from each other. Haven't taken a reading today tho...after 100% charge. Will do that tomorrow to see if there's any difference.

 

[DaveEV]

Does anyone know which measure Nissan Battery Warranty uses?

Four capacity bars gone. So you need to be at 8 or fewer left within the 5 years/60,000 miles.

ok thnx. I just lost the 2nd bar last week. If it's linear, I will lose that 4th in two yrs, which would be 4 yrs and around 40K miles.

Keep in mind that first bar is about 15% capacity lost, while each subsequent bar is about 6% capacity lost. Since in theory capacity lost should be greatest when the pack is new, bars 3 and 4 should take longer to go away than bar 2 did.

Also keep in mind that losing your 2nd bar is likely premature (the P3227 update makes the capacity bars more accurate), so if it doesn't come back, it will probably hang around for a while.

Before p3227 update: Ahr= 51.12 (77.16%) Health=72.54%
After p3227 update: Ahr= 56.42 (85.16%) Health=72.44%

Hopefully Ahr capacity
Interesting that the health was more or less unchanged.. based on other posts I'd seen it looked like it moved a lot after the update.

Yup, I noticed that too... I made sure I took the readings right before and after the update, right at the dealer, 1hr 15min from each other. Haven't taken a reading today tho...after 100% charge. Will do that tomorrow to see if there's any difference.

Health seems to be the quickest to respond, though Ah seems to take a week or two to settle down. Within a week you should know what your true capacity loss is assuming that the P3227 update truly fixes the accuracy of the capacity bars and Ah readings.

 

[dgpcolorado]

Before p3227 update: Ahr= 51.12 (77.16%) Health=72.54%
After p3227 update: Ahr= 56.42 (85.16%) Health=72.44%

Does anyone know which measure Nissan Battery Warranty uses?

Hopefully Ahr capacity
Interesting that the health was more or less unchanged.. based on other posts I'd seen it looked like it moved a lot after the update.

My "Health?" was pretty much unchanged right after the update. Then it started falling like a rock. I'd say give it a few days to see how it shakes out.

 

[TickTock]

Does anyone know which measure Nissan Battery Warranty uses?

Four capacity bars gone. So you need to be at 8 or fewer left within the 5 years/60,000 miles.

That is the first check but then they attach their equipment (either consult3 or DR-V) and read the health (carcan msgId 5b32 - NOT "hlth/Xfactor/???") and confirm that the SOH is really below the threshold (not sure of this value - 70% presumably). From what I've been able to gather from my own logs and logs from a few others who have shared, this SOH does appear to track Ah (Ah/66*100) so if your device doesn't display the 5b3 message, you should be able to calculate it from Ah. However, until we get more devices displaying the SOH for comparison, I would treat the Ah/66*100 formula with a bit of skepticism.

 

[opencar]

[/quote]Four capacity bars gone. So you need to be at 8 or fewer left within the 5 years/60,000 miles.[/quote]ok thnx. I just lost the 2nd bar last week. If it's linear, I will lose that 4th in two yrs, which would be 4 yrs and around 40K miles.[/quote]
Keep in mind that first bar is about 15% capacity lost, while each subsequent bar is about 6% capacity lost. Since in theory capacity lost should be greatest when the pack is new, bars 3 and 4 should take longer to go away than bar 2 did.

one factor that counters this trend for bars 3 and 4 is that as you lose more and more capacity, one would tend to do more charges to 100% rather than 80% and perform more charge cycles in a given time period as you compensate for less range. btw, did the P3227 update today & there was no change to the Ahr reading (unlike most experience reported on the forum)