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Stanton
Posts: 2609
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
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Re: The 40KWH Battery Topic

rogersleaf wrote: Fri Jan 07, 2022 12:32 am Also... take your readings with SOC fully charged, will likely be closer to 3-4mV spread.
Not necessarily: his 22mV reading was at pretty high SoC (~90%).
I have a "weak" cell with similar behavior: ~20mV at high SoC and ~40mV at low SoC. Not terrible, but definitely "weak". I'm contemplating "draining" the pack (as has been mentioned earlier in this thread) to try and force a balance, but am reluctant to do it in cold weather...and not 100% convinced that it's limiting my range (yet).
2011 Blue Ocean SV w/OVMS
12v LiFePO4 battery
FIAMM 74100 horns/Wet Okole seat covers/Tor's heater mod/Dala's CAN-bridge
Lizard Pack (Rev E) installed @51 months/41k miles
40 kWh Pack (Gen2) installed @115 months/84k miles
HerdingElectrons
Posts: 267
Joined: Sat Sep 08, 2018 3:20 pm
Delivery Date: 17 Sep 2018
Location: Central Coast, Ca

Re: The 40KWH Battery Topic

Stanton wrote: Fri Jan 07, 2022 8:59 am Not necessarily: his 22mV reading was at pretty high SoC (~90%).
I think you are swapping screenshots. My 22mV cell differential is at 67.8% SOC. I typically run my car between 25-75% so a slow 10A 230V charge to full full may actually balance the pack a bit.

I'm reviewing multiple LS screenshots & I have been 15-20mV cell balance going back 2 years. In fact I have a 24mV one back when the car wasn't even a year old & only had 16K mile vs the 44K I have now. But I also have a 5mV one just a month prior and multiple 10mV afterwards so I'm less worried about the current fluctuation.

I have several 5-7mV screen shots when the car was new to 6 months old.

I also don't notice a substantial reduction in range yet either.
2018 SL Pearl White 4.5/3.9; 5.0/4.6 with 205/65/16 tires)

09/18-01K Mi: 114.52AHr / SOH= 99.20%
04/19-10K Mi: 111.45AHr / SOH= 96.54%
11/19-20K Mi: 107.44AHr / SOH= 93.07%
12/20-33K Mi: 105.39Ahr / SOH= 91.29%
04/21-35K Mi: 104.32Ahr / SOH= 90.37%
jmurtagh13
Posts: 39
Joined: Sun Nov 01, 2015 4:54 am
Delivery Date: 10 Mar 2018
Leaf Number: 300844
Location: Atlanta GA

Re: The 40KWH Battery Topic

Image

Almost 4 years old (32K miles) SOH down almost 11% Not Bad. Last 12 months lost just .41% Last 2 years 2.6%
2018 Leaf March 10, 2018
49 months, 36,000 miles
SOH 88.32
watchdoc
Posts: 106
Joined: Sun Sep 19, 2021 6:15 am
Delivery Date: 03 Jan 2022
Location: Greenville, NC

Re: The 40KWH Battery Topic

jmurtagh13 wrote: Mon Jan 10, 2022 10:49 am Image

Almost 4 years old (32K miles) SOH down almost 11% Not Bad. Last 12 months lost just .41% Last 2 years 2.6%
Love this chart and graph. does Leaf Spy do this for you or are you plugging info into something else?
22 Leaf SV+ Deep Blue Pearl
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knightmb
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Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: The 40KWH Battery Topic

watchdoc wrote: Mon Jan 10, 2022 12:45 pm Love this chart and graph. does Leaf Spy do this for you or are you plugging info into something else?
I would say watchdoc knows a way around the spreadsheets ;)
2020 Leaf SL Plus - (Manufacture Date March 2020)
2018 Leaf SL - (Manufacture Date February 2018)
2013 Leaf SV - (8 faithful years of service before trade in at 75,679 miles LeafSpy-Data)
Timekoin - The World's Most Energy Efficient Encrypted Digital Currency
jmurtagh13
Posts: 39
Joined: Sun Nov 01, 2015 4:54 am
Delivery Date: 10 Mar 2018
Leaf Number: 300844
Location: Atlanta GA

Re: The 40KWH Battery Topic

I produce the chart in MS Excel. I just take the numbers from LS and plug then in each month.
2018 Leaf March 10, 2018
49 months, 36,000 miles
SOH 88.32
danrjones
Posts: 1361
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

Re: The 40KWH Battery Topic

danrjones wrote: Mon Jan 03, 2022 10:26 am Ahr: 100.95
SOH: 87.45
V: 395.86
Hx: 94.89
SOC: 90.01
Today's numbers:

Ahr: 100.94
SOH: 87.44
V: 351.5
Hx: 94.94
SOC: 48.9

ODO 12,649
17 QCs / 601 L2

Bonus:
Max Temp: 46.7 f
Min Temp: 42.7 f
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19
HerdingElectrons
Posts: 267
Joined: Sat Sep 08, 2018 3:20 pm
Delivery Date: 17 Sep 2018
Location: Central Coast, Ca

Re: The 40KWH Battery Topic

Quick follow up regarding my 'cell imbalance'; the other day I left my car charging longer than intended & reached 97% SOC indicated because I am going to do a balancing charge when I can plan a long enough trip to consume enough to be able to park at less than my desired 75%. Even without a full balancing session I am pleased with how my pack is reporting considering the age, milegae & prior generations of pack degradation:

Image

Image
2018 SL Pearl White 4.5/3.9; 5.0/4.6 with 205/65/16 tires)

09/18-01K Mi: 114.52AHr / SOH= 99.20%
04/19-10K Mi: 111.45AHr / SOH= 96.54%
11/19-20K Mi: 107.44AHr / SOH= 93.07%
12/20-33K Mi: 105.39Ahr / SOH= 91.29%
04/21-35K Mi: 104.32Ahr / SOH= 90.37%
User avatar
knightmb
Forum Supporter
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Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: The 40KWH Battery Topic

My wife's 2018 Leaf finally broke the 92% SOH barrier after 4 years (this month is the birthday for the it, if that was a thing :lol: )

Image
2020 Leaf SL Plus - (Manufacture Date March 2020)
2018 Leaf SL - (Manufacture Date February 2018)
2013 Leaf SV - (8 faithful years of service before trade in at 75,679 miles LeafSpy-Data)
Timekoin - The World's Most Energy Efficient Encrypted Digital Currency
danrjones
Posts: 1361
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

Re: The 40KWH Battery Topic

I haven't updated since Jan 11th. Looks like I must have had an "adjustment" sometime the last week or two, and I (think) I am perilously close to loosing my first battery bar.

For REF on Mar 1st I was at at SOH 87.40

Yesterday:

SOH: 86.00
AmpHr: 99.28
Hx: 94.64
Miles: 13577
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19

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