LeafMuranoDriver
Posts: 325
Joined: Wed May 13, 2015 8:15 am
Delivery Date: 01 May 2015
Leaf Number: 323189
Location: Los Angeles, CA

Re: Post Your Battery Degradation Results

Tue Jan 24, 2017 11:16 am

arnis wrote:I think I have extraterrestrial battery on my Leaf.
Did one 100% 59 minute charge at DC-station.
Hx/SOH went up after DC-charge from 95 to 98,39%, SOH 98%.
Unrealistic numbers. I felt 95% was more-or-less correct.

279GIDs my *ss :roll: Not possible. Battery is 2,5 years old, 46600 miles, almost out of warranty.

Why is it not possible?
2015 Leaf S w/ QC
Mfg: Jan. '15 // Pur: May '15
Best: 6/27/15 - 1,416 Miles - 292 GIDs - 63.11 Ahr - 22.6 kWh - 100% SOH - 97.2% Hx - 4 QC, 29 L2
Worst: 12/12/15 - 4,616 Miles - 259 GIDs - 55.02 Ahr - 20.1 kWh - 99% SOH - 82.8% Hx - 17 QC, 96 L2

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Stanton
Forum Supporter
Posts: 1944
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
Contact: Website Twitter

Re: Post Your Battery Degradation Results

Tue Jan 24, 2017 12:33 pm

kjpowers wrote:
VitaminJ wrote:Two routes you can take, try to preserve or try to accelerate the impending failure.

Best way to kill lithium batteries in my experience is to run them dead. Do you have another car? Run the Leaf to turtle and park it and don't plug it in. I would imagine after a week or two it would have discharged below the safe level and start to go bad fast.

Shame I did not know this. I was told to run it up to 100% and leave it for 2 weeks. Which is what I did. I am not able to let it sit right now. BUT I do turtle it almost every day trying to get to work.


You do BOTH: cycle it as much as you can and leave it sitting at 100% as much as you can...IN THE HEAT!
There's a million threads on "how to kill your battery": why is there so much confusion?
2011 Blue Ocean SV w/floor mats & window tint
12v LiFePO4 battery & FIAMM 74100 horns
Wet Okole seat covers (front)
Tor's low-power heater mod
2013 sun visor
3G modem upgrade
L2 EVSE Upgrade
Battery Pack replaced (Rev E) @51 months and 41k miles

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lpickup
Posts: 983
Joined: Thu Nov 17, 2011 2:14 pm
Delivery Date: 23 Dec 2016
Leaf Number: 312310
Location: Raleigh, NC
Contact: Website

Re: Post Your Battery Degradation Results

Tue Jan 24, 2017 12:40 pm

Stanton wrote:You do BOTH: cycle it as much as you can and leave it sitting at 100% as much as you can...IN THE HEAT!
There's a million threads on "how to kill your battery": why is there so much confusion?


I had better "luck" leaving it as low SOC as possible in the heat. When I left it at high SOC (or 100%) I found the cell balancing pretty much kept my SOH steady.
...Lance

Coulis Red 2016 SV (312310)
Delivered: 12/23/16
Glacier Pearl 2012 SL (016138)
Delivered: 12/9/11; traded in 12/23/16
NOGA$4ME Blog

VitaminJ
Posts: 373
Joined: Tue Jan 03, 2017 11:46 am
Delivery Date: 07 Jan 2017
Leaf Number: 415775
Location: Morrison, CO
Contact: YouTube

Re: Post Your Battery Degradation Results

Tue Jan 24, 2017 12:44 pm

Stanton wrote:You do BOTH: cycle it as much as you can and leave it sitting at 100% as much as you can...IN THE HEAT!
There's a million threads on "how to kill your battery": why is there so much confusion?

I was talking generally about lithium batteries; discharging the cells below their fully-depleted voltage will cause FAR more damage FAR faster than keeping it at 100%. I know it's commonly said to keep it at 100% on this forum, but based on his experience that increased his battery's health when he tried. Also I'm not sure where he lives but he may have trouble finding HEAT to park it in right now.

Lastly, the Leaf has a low voltage cutoff (turtle) that will protect the car from intentionally discharging below the safe limit, so extraordinary measures need to be taken to get around that which is why I suggested taking it to turtle and parking it for a long period of time so any parasitic drain will do it's work. I am not sure, maybe the Leaf can put the battery in a protective state where it will have no parasitic drain whatsoever. Just trying to help by providing my experience.
2013 Ocean Blue SV w/ QC and LED
- +0.2 mi/kwh Aeromods
- 2lb 5Ah LiFe 12v battery

arnis
Posts: 742
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Post Your Battery Degradation Results

Tue Jan 24, 2017 2:25 pm

Discharged and kept in heat is more degrading than fully charged and kept in the heat.
Reason is that 100% is only 4.1-4,14V. That is far from uncomfortable.
On the other end Leaf dies when one of the cellpairs falls below 2.6V, even for a second.
Discharge it down to 0 bars (no turtle). Park it safely. Leave the vehicle on (no need for
heavy climate control drain). It will get down to turtle and then, eventually, one of the cellpairs
will dip below 2.6V limit. At that moment it is important to switch the vehicle off (otherwise
12V battery will be depleted). Vehicle will not engage drive mode until charge state above VLBW.
But if one of the cellpairs was at 2.6V without motor/AC drain, it will continue dropping voltage
within few days even without any load. Most likely only one cellpair will fail (the weakest one)
as there is lower limit for cellpair voltages that is acceptable to initiate charging.
NB! There is time limitation of doing that without killing warranty. Read the terms.
But it can be done again.
I would recommend to NOT CHARGE to 100% at all. Doing that for two months unbalanced
my new pack. Unbalanced pack has lower capacity compared to properly balanced one.
Repeating turtle discharge with letting it sit there for allowed time limit will degrade pack eventually.
PS! battery should be at least 25C/77F, otherwise it is in comfort zone. Anything above 40C /104F
and results will be noticeable within few weeks.
PS! discharging pack below LBW will tremendously heat it up compared to 20-100% charge state.

Be sure not to void the warranty.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

leafitbe
Posts: 5
Joined: Wed Oct 12, 2016 11:47 am
Delivery Date: 12 Oct 2016
Leaf Number: 7852

Re: Post Your Battery Degradation Results

Thu Feb 02, 2017 10:57 am

So, my LEAF dropped to 8 bars at 60,300.
I had to start driving it (renting a car was getting expensive) and the AHr wasn't dropping with the car sitting.
Called the EV helpline, and after 3 weeks of deliberation they said there was nothing they could do for me.
They said I could finance a battery through Nissan, I guess because I'm in Virginia, but the total would be close to $7k with installation costs.
I'd be better off selling my LEAF for $5k and buying a 2015 LEAF SL for $9k (with the better battery chemistry.
Sucks.
Nissan just became a 4-letter word.

arnis
Posts: 742
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Post Your Battery Degradation Results

Thu Feb 02, 2017 2:02 pm

leafitbe wrote:Nissan just became a 4-letter word.


Incorrect. They are that 4-letter word for at least 4 years.
Check mileage when you got the car (warranty first page).

You lost that last bar 0.5% over warranty. If Nissan thinks that you should pay 100% for the battery
they just upgrade their level of being that 4-letter word. World leaders of being unimaginably selfish.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

Relayer1956
Posts: 22
Joined: Fri Jan 17, 2014 6:13 pm
Delivery Date: 02 Sep 2014
Leaf Number: 304279
Location: Indio, CA

Re: Post Your Battery Degradation Results

Thu Feb 02, 2017 4:47 pm

My 2015 SL just lost the second bar today (2-2-17).

Here are the stats after a full charge overnight on my home L2 charger:

Mileage: 37,888
SOC: 97.0%
SOH: 78%
Hx: 61.54%
Ahr: 48.84
GIDs: 229

17.7 kWh remaining.
Mike McNamara, P.E.
Indio, CA
2015 Grey Leaf SL Premium Packages; 2017 Chevy Bolt Premium; 2012 BMW R1200GS Adventure
Planned 19.8kW PV System
"Where is The Lithium Valley?"

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drees
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Joined: Fri Apr 23, 2010 3:51 pm
Location: San Diego

Re: Post Your Battery Degradation Results

Mon Feb 06, 2017 10:28 pm

leafitbe wrote:Sucks.

I feel your pain. Next step, BBB Arbitration. I've been dragging my heels there and need to get that process going again. It's demoralizing.
'11 LEAF SL Powered By 3.24 kW Enphase Solar PV

mtndrvr
Posts: 28
Joined: Sun Jun 29, 2014 7:37 am
Delivery Date: 10 May 2014
Leaf Number: 2630

Re: Post Your Battery Degradation Results

Sat Feb 11, 2017 12:43 pm

mtndrvr wrote:2/11/17
31,512 miles
63.65 Ahr
97% SoC
276 GIDs


1/4/16
22,67 miles
64.65 Ahr
97% SoC
279 GIDs
98% SoH
5 QC and 796 Level1/2 charges

Battery seems to like the mountains of CO so far

mtndrvr wrote:2013 Leaf, purchased in April 2014

4/27/15
12,094 miles
65.96 Ahr
97% SoC
284 GIDs

9/22/15
19,294 miles
62.7 Ahr
97 SoC
272 GIDs

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