## The 40KWH Battery Topic

goldbrick
Posts: 1302
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

### Re: The 40KWH Battery Topic

I've been thinking the same thing for a while. It almost seems the SOH is just an estimate based on time, temperature, probably a few other inputs. Its accuracy is anyone's guess. The only true test is still an external range test. The nice thing about that is it's impossible to get to tenths of a % accuracy so one doesn't have to fret over every single little drop.

HerdingElectrons
Posts: 222
Joined: Sat Sep 08, 2018 3:20 pm
Delivery Date: 17 Sep 2018
Location: Central Coast, Ca

### Re: The 40KWH Battery Topic

danrjones wrote:
Tue Apr 20, 2021 9:39 am

How is our AHr the same but different SOH?
The short answer is I have no idea.

Thinking about what is your typical mV spread in leaf spy? Mine is 12-18mV & perhaps if yours is higher then that may explain since presumably a greater mV spread would indicate less total capacity since the lowest mV cells obfuscates the capacity difference of the higher mV cells.
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%

rogersleaf
Posts: 301
Joined: Sun May 18, 2014 7:50 pm
Delivery Date: 22 Mar 2019
Leaf Number: 307726
Location: Kent, Ohio

### Re: The 40KWH Battery Topic

HerdingElectrons wrote:
Sun Apr 25, 2021 9:04 am
danrjones wrote:
Tue Apr 20, 2021 9:39 am

How is our AHr the same but different SOH?
The short answer is I have no idea.

Thinking about what is your typical mV spread in leaf spy? Mine is 12-18mV & perhaps if yours is higher then that may explain since presumably a greater mV spread would indicate less total capacity since the lowest mV cells obfuscates the capacity difference of the higher mV cells.
12-18mV seems like a large spread. I don't check mine frequently but usually is 2-3mV.
Are you seeing this fully charged? and allow the charging to complete & shut off through it's rebalancing routine?
2014 SV - Brilliant Silver - returned 1/2017 at end of lease.
2019 SL - White - w/Tech Package

Stanton
Posts: 2369
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX

### Re: The 40KWH Battery Topic

rogersleaf wrote:
Sun Apr 25, 2021 5:36 pm
HerdingElectrons wrote:
Sun Apr 25, 2021 9:04 am
Thinking about what is your typical mV spread in leaf spy? Mine is 12-18mV & perhaps if yours is higher then that may explain since presumably a greater mV spread would indicate less total capacity since the lowest mV cells obfuscates the capacity difference of the higher mV cells.
12-18mV seems like a large spread. I don't check mine frequently but usually is 2-3mV.
Are you seeing this fully charged? and allow the charging to complete & shut off through it's rebalancing routine?
I often see spreads up to 20mV and hardly ever see them under 5mV...so I think he's fine.
2011 Blue Ocean SV w/OVMS
12v LiFePO4 battery w/Antigravity Battery Tracker
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/85k miles

danrjones
Posts: 1077
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

### Re: The 40KWH Battery Topic

I charge up to about 70% and usually see a mV spread of 12 to 18. Sounds about the same.
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19

Stanton
Posts: 2369
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX

### Re: The 40KWH Battery Topic

Finally charged my 40kWh pack to 100%, so here are some readings:
• GIDs = 480
• Pack voltage = 403
• Ahr = 110
• Hx = 101
• SOH = 95
Last edited by Stanton on Sun May 09, 2021 5:19 am, edited 3 times in total.
2011 Blue Ocean SV w/OVMS
12v LiFePO4 battery w/Antigravity Battery Tracker
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/85k miles

DaveinOlyWA
Posts: 15678
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

### Re: The 40KWH Battery Topic

rogersleaf wrote:
Sun Apr 25, 2021 5:36 pm
HerdingElectrons wrote:
Sun Apr 25, 2021 9:04 am
danrjones wrote:
Tue Apr 20, 2021 9:39 am

How is our AHr the same but different SOH?
The short answer is I have no idea.

Thinking about what is your typical mV spread in leaf spy? Mine is 12-18mV & perhaps if yours is higher then that may explain since presumably a greater mV spread would indicate less total capacity since the lowest mV cells obfuscates the capacity difference of the higher mV cells.
12-18mV seems like a large spread. I don't check mine frequently but usually is 2-3mV.
Are you seeing this fully charged? and allow the charging to complete & shut off through it's rebalancing routine?
Well, that is unusual...
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 19,653 mi, 93.47% SOH
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

danrjones
Posts: 1077
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

### Re: The 40KWH Battery Topic

Latest stats for today:

SOH: 87.23
AMPhr: 100.7
Hx: 102.26

10,059 miles

I should be close to my next three month update, if there is one.
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19

danrjones
Posts: 1077
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

### Re: The 40KWH Battery Topic

danrjones wrote:
Thu Jun 03, 2021 7:21 am
Latest stats for today:

SOH: 87.23
AMPhr: 100.7
Hx: 102.26

10,059 miles

I should be close to my next three month update, if there is one.
Finished my 3 month update.
It was small, but at least it was up this time.

Sitting at:

SOH: 87.90
AMPHr: 101.47
Hx: 102.33
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19

DougWantsALeaf
Posts: 2775
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

### Re: The 40KWH Battery Topic

Good news indeed.
2019 S Plus (93.86% SOH) & 2019 SV Plus (93.35% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
100 Mile Club Member (Number 87)
Max Miles on 13 Leaf: 120 miles
Max Miles on 19 SV+: 242 Highway miles @ 4.5 miles/kWh