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"Lizard" battery stats - hot climate

Posted: Sun Jun 30, 2019 11:32 am
by Marktm
Thought I'd post the latest amp-hour chart for my 2012 Leaf, with the hope that others that have similar data can compare based on similarities/dissimilarities. The data is based on a new replacement battery installed in November of 2016.
- Mostly commuter/in town use with occasional highway trips to the City (Houston). Most average speeds around 20 - 30mph
- Garage kept almost all the time. A few occasions of parking in full sun on hot pavement
- Houston, TX climate. Battery temps range between the 60's to high 90's
- Not sure I've QC's even once with the replacement battery - use home 240 VAC charger (~16 amps)
- Beginning mileage - 29,760; Last mileage - 44,069

Actually surprised how consistent the curve varies winter to summer. Hoping that the "winter drop" is not so pronounced this year - we'll see.





Battery log 6.30.19.jpg

Re: "Lizard" battery stats - hot climate

Posted: Sun Jun 30, 2019 2:48 pm
by SageBrush
ouch

Re: "Lizard" battery stats - hot climate

Posted: Mon Jul 01, 2019 12:32 pm
by A4stewart
I bought a 2013 Leaf SV without the quick charger option two years ago. It was a "cool climate" Leaf from Tacoma Washington and now Vancouver BC. It has a lizard battery, one of the first of the modified chemistry from April 2013 manufacture date. It is now showing 90.5% of original capacity with 59 amp hours after all this time according to Leafspy. It has 68,047 kms. on the odometer. Charging has been done mostly with Level 2 home charger, and charged to 100%.

Overall pretty happy with the low amount of degradation.

Re: "Lizard" battery stats - hot climate

Posted: Mon Jul 01, 2019 1:08 pm
by cwerdna
A4stewart wrote:I bought a 2013 Leaf SV without the quick charger option two years ago. It was a "cool climate" Leaf from Tacoma Washington and now Vancouver BC. It has a lizard battery, one of the first of the modified chemistry from April 2013 manufacture date. It is now showing 90.5% of original capacity with 59 amp hours after all this time according to Leafspy. It has 68,047 kms. on the odometer. .
"Lizard" pack didn't exist in 2013 in customer's hands. If it's the original pack from an April 2013 build, you don't have the lizard pack.

Re: "Lizard" battery stats - hot climate

Posted: Mon Jul 01, 2019 1:53 pm
by LeftieBiker
cwerdna wrote:
A4stewart wrote:I bought a 2013 Leaf SV without the quick charger option two years ago. It was a "cool climate" Leaf from Tacoma Washington and now Vancouver BC. It has a lizard battery, one of the first of the modified chemistry from April 2013 manufacture date. It is now showing 90.5% of original capacity with 59 amp hours after all this time according to Leafspy. It has 68,047 kms. on the odometer. .
"Lizard" pack didn't exist in 2013 in customer's hands. If it's the original pack from an April 2013 build, you don't have the lizard pack.
Cwerdna is correct. The improved chemistry that was used starting in 4/2013, and nicknamed the "Wolf Pack" by me, isn't quite as heat resistant as the Lizard pack, although it performs very close to it in other respects. The Lizard Pack was introduced for the 2015 model year.

Re: "Lizard" battery stats - hot climate

Posted: Mon Jul 01, 2019 2:07 pm
by cwerdna
For reference, A4stewart can look at these:
https://mynissanleaf.com/viewtopic.php? ... ng#p320754
viewtopic.php?t=17168 - search for lizard

Re: "Lizard" battery stats - hot climate

Posted: Mon Jul 01, 2019 5:55 pm
by GerryAZ
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.

Re: "Lizard" battery stats - hot climate

Posted: Mon Jul 01, 2019 11:14 pm
by 91040
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.

Re: "Lizard" battery stats - hot climate

Posted: Mon Jul 01, 2019 11:21 pm
by LeftieBiker
Maybe there is less variation in day to day and time of day temperatures in the LA Basin than in Phoenix?

Re: "Lizard" battery stats - hot climate

Posted: Tue Jul 02, 2019 8:08 am
by Stanton
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
I have driven about half as many miles (~35,000) in approximately the same time (battery replaced in December 2015) with similar results (~52.1 AHr). I can definitely say my Lizard battery has performed better than the original; even if I hit 2 bars by the end of this year, I lost 4 bars over the same time period with the original battery.