lorenfb
Posts: 2308
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: "Lizard" battery stats - hot climate

Tue Jul 02, 2019 10:03 am

GerryAZ wrote:I suppose I should contribute to this thread. I saw gradual capacity loss until about 10 months ago (well over 60,000 miles),. Now there appear to be several weak cell pairs getting progressively weaker (based upon Leaf Spy data) which are limiting the energy storage capability of the full battery pack, and thus limiting usable range. The weak cells reach minimum voltage and cause turtle followed by shutdown even though there is a lot of energy left in the remaining cells. The weak cells reach maximum voltage while charging before the other cells so they also limit maximum charge of the pack.

The internal resistance also appears to be increasing over time and that is causing the battery temperature to be significantly higher this summer than during the previous 4 summers. In the past, the battery temperature would gradually cool off during highway driving after a DCQC, but now the temperature increases while driving on the highway. The odometer currently indicates 80813 miles while the car is charging at a DCQC station since I can no longer make my round trip commute without charging. The higher internal resistance and weak cells also limit regeneration and cause slower charging on DCQC.


When it's convenience, consider determining and posting your internal battery resistance as described here;
http://mynissanleaf.com/viewtopic.php?f ... 20#p559503

Thanks
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=78, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 8.5K miles, 115 Ahrs, 5.2 miles/kWh (average), Hx=98, SOH=99, DOD > 20%, temp < 105F

Trolleydodger78
Posts: 11
Joined: Sun Nov 25, 2018 11:13 am
Delivery Date: 24 Nov 2018
Leaf Number: 019388
Location: Los Angeles

Re: "Lizard" battery stats - hot climate

Wed Jul 17, 2019 8:35 am

91040 wrote:The degradation slope of my traction battery is quite smooth when compared to Marktm’s, even when plotted monthly. I live in the San Fernando Valley area of Los Angeles. The battery has ~70k miles on it.

9/28/15 61.14Ahr
10/1/16 62.36 Ahr
10/1/17 57.02 Ahr
10/1/18 54.17 Ahr
7/1/19 51.87 Ahr

Edit: Rescaled the monthly Ahr readings on my chart to match Marktm’s. The slope now resembles his chart more but is still slightly smoother.
My battery is looking similar. I bought my 2012 Leaf 8 months ago so I don't know the previous owners numbers. I estimate the new battery has 24k miles on it after roughly 2 1/2 years. I am also in Los Angeles and previous owner was driving it in San Bernardino, CA.

2/17 - new battery
2/19 - 57.05 Ahr
7/19 - 56.19 Ahr
'12 Leaf SL - Bought used
02/17 - 00.0? Ahr - 32k miles - New battery
02/19 - 57.05 Ahr - 49k miles
11/19 - 52.24 Ahr - 60k miles - 1st bar lost
02/20 - 49.50 Ahr - 63k miles
-----
'17 500-e - Leased, returned | '14 Volt - Leased, returned

Trolleydodger78
Posts: 11
Joined: Sun Nov 25, 2018 11:13 am
Delivery Date: 24 Nov 2018
Leaf Number: 019388
Location: Los Angeles

Re: "Lizard" battery stats - hot climate

Thu Dec 19, 2019 12:42 pm

91040 wrote:
Mon Jul 01, 2019 11:14 pm
The degradation slope of my traction battery is quite smooth when compared to Marktm’s, even when plotted monthly. I live in the San Fernando Valley area of Los Angeles. The battery has ~70k miles on it.

9/28/15 61.14Ahr
10/1/16 62.36 Ahr
10/1/17 57.02 Ahr
10/1/18 54.17 Ahr
7/1/19 51.87 Ahr

Edit: Rescaled the monthly Ahr readings on my chart to match Marktm’s. The slope now resembles his chart more but is still slightly smoother.
Hi @91040, can you tell me your charging habits?

I live close to SFV and commute to Glendale so experience the same weather as you. Last year I pushed the battery hard out of necessity. My soon-to-be 3 year old lizard battery is already down to 50.26 Ahr and is dropping after every charge. At this rate, in two years I'll have trouble making my commute just one way (40 miles). I'm able to baby the battery now, but wonder if the damage is done and I should start shopping for another car.
'12 Leaf SL - Bought used
02/17 - 00.0? Ahr - 32k miles - New battery
02/19 - 57.05 Ahr - 49k miles
11/19 - 52.24 Ahr - 60k miles - 1st bar lost
02/20 - 49.50 Ahr - 63k miles
-----
'17 500-e - Leased, returned | '14 Volt - Leased, returned

91040
Posts: 1019
Joined: Fri Mar 11, 2011 10:36 pm
Delivery Date: 06 May 2011
Location: Los Angeles, CA

Re: "Lizard" battery stats - hot climate

Sat Dec 21, 2019 5:36 pm

I doubt my charging habits make that much of a difference in my traction battery’s stats compared to most others. My guess is that any better longevity is due to driving very conservatively for range. My long term average efficiency is 4.8 miles per kWh. That means less heat creation and fewer charging cycles.

Most of my charging is with L2 but I do QC whenever there is a need, usually a couple of times a month. The car is kept in a garage that can get quite hot. Typically, I return home between LBW and VLBW. If lower, I will charge to VLBW immediately. Then, a 100% charge will be set to end by 10a the morning of the next day it will be driven. Often, it sits fully charged until around 6p. Not ideal but avoids peak electricity rates. The charge is set to finish closer to departure on the weekends.

Today, my 50 month old lizard battery is at 49.38Ah after 78k miles.
Trolleydodger78 wrote:
Thu Dec 19, 2019 12:42 pm

Hi @91040, can you tell me your charging habits?

I live close to SFV and commute to Glendale so experience the same weather as you. Last year I pushed the battery hard out of necessity. My soon-to-be 3 year old lizard battery is already down to 50.26 Ahr and is dropping after every charge. At this rate, in two years I'll have trouble making my commute just one way (40 miles). I'm able to baby the battery now, but wonder if the damage is done and I should start shopping for another car.
1st Capacity Bar loss 30k mi 16mo
2nd- 49k mi 25.5mo 51.5Ah
3rd- 73k mi 36.5mo 46.9Ah
4th- 86.5k mi 43mo 42.6Ah
5th- 101k mi 50.5mo 38.4Ah, end 36.1Ah
New Battery 9/28/15 104k mi 66.1Ah
1st- 160.5k mi 34mo 54Ah
2nd- 184.4k mi 53mo 49Ah

Trolleydodger78
Posts: 11
Joined: Sun Nov 25, 2018 11:13 am
Delivery Date: 24 Nov 2018
Leaf Number: 019388
Location: Los Angeles

Re: "Lizard" battery stats - hot climate

Sun Dec 22, 2019 10:56 pm

91040 wrote:
Sat Dec 21, 2019 5:36 pm
I doubt my charging habits make that much of a difference in my traction battery’s stats compared to most others. My guess is that any better longevity is due to driving very conservatively for range. My long term average efficiency is 4.8 miles per kWh. That means less heat creation and fewer charging cycles.

Most of my charging is with L2 but I do QC whenever there is a need, usually a couple of times a month. The car is kept in a garage that can get quite hot. Typically, I return home between LBW and VLBW. If lower, I will charge to VLBW immediately. Then, a 100% charge will be set to end by 10a the morning of the next day it will be driven. Often, it sits fully charged until around 6p. Not ideal but avoids peak electricity rates. The charge is set to finish closer to departure on the weekends.

Today, my 50 month old lizard battery is at 49.38Ah after 78k miles.
Thank you! This information is helpful.
'12 Leaf SL - Bought used
02/17 - 00.0? Ahr - 32k miles - New battery
02/19 - 57.05 Ahr - 49k miles
11/19 - 52.24 Ahr - 60k miles - 1st bar lost
02/20 - 49.50 Ahr - 63k miles
-----
'17 500-e - Leased, returned | '14 Volt - Leased, returned

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