DougWantsALeaf
Posts: 286
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: How to Check Battery Capacity, Degradation and Range

Thu Jan 30, 2014 12:06 pm

Tony,

Are we seeing consistantly lower GID readings out of the US batteries? Do you think that is due to quality/control issues, or change in chemistry?

Thank you
2013 SV Black
Miles: 17500
Average Carwings/Dash Efficiency: 4.5-6.5M/KWh (summer) ~2.8-3.9 winter
100 Mile Club Member (Number 87), Max distance 120 miles

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TonyWilliams
Posts: 9970
Joined: Sat Feb 19, 2011 1:48 am
Location: San Diego
Contact: Website

Re: How to Check Battery Capacity, Degradation and Range

Thu Jan 30, 2014 12:11 pm

DougWantsALeaf wrote:Tony,

Are we seeing consistantly lower GID readings out of the US batteries? Do you think that is due to quality/control issues, or change in chemistry?

Thank you


If I had to guess, it's because of changes related to heat degradation prevention.

stjohnh
Posts: 321
Joined: Tue Jun 18, 2013 4:27 pm
Delivery Date: 10 Jun 2013
Leaf Number: 409675
Location: Palo Alto, CA

Re: How to Check Battery Capacity, Degradation and Range

Thu Jan 30, 2014 1:21 pm

TonyWilliams wrote:
DougWantsALeaf wrote:Tony,

Are we seeing consistantly lower GID readings out of the US batteries? Do you think that is due to quality/control issues, or change in chemistry?

Thank you


If I had to guess, it's because of changes related to heat degradation prevention.


Its not clear to me that the lower gids and lower capacity numbers mean the battery actually stores less energy. It may mean that Nissan's programming is reporting this information differently. After all, the Leafs still have about the same range.
Blessings,
Holland

2 LEAFS, bought 1 week apart. 2013 S for me, 2013 SV is wife's. Both manufactured May 2013, both battery capacity about 60.5 AHr. Both with normal range. No degradation after 2 years and 19,000 miles.

DougWantsALeaf
Posts: 286
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: How to Check Battery Capacity, Degradation and Range

Thu Jan 30, 2014 3:50 pm

What does the DTE stand for On the leaf spy?
2013 SV Black
Miles: 17500
Average Carwings/Dash Efficiency: 4.5-6.5M/KWh (summer) ~2.8-3.9 winter
100 Mile Club Member (Number 87), Max distance 120 miles

leafwing
Posts: 146
Joined: Fri Mar 25, 2011 7:47 pm
Delivery Date: 24 Mar 2011
Leaf Number: 0573
Location: Plano, TX

Re: How to Check Battery Capacity, Degradation and Range

Thu Jan 30, 2014 7:22 pm

DougWantsALeaf wrote:What does the DTE stand for On the leaf spy?

My guess DTE stands for death to empire.
Lost the first capacity bar on 7/04/2012.
Lost the second bar on 6/26/2013.
Lost the third bar on 6/17/2014.
Lost the Fourth Capacity bar on 6/7/2015.

mbender
Posts: 824
Joined: Sun Apr 21, 2013 8:11 am
Delivery Date: 31 Aug 2014
Leaf Number: 309606
Location: The Great California Delta, and environs

Re: How to Check Battery Capacity, Degradation and Range

Thu Jan 30, 2014 7:46 pm

DougWantsALeaf wrote:What does the DTE stand for On the leaf spy?
My guess, with the help of acronymfinder, is Data Terminal Equipment.

Or Distance to Empty? (I don't have a Spy. I suspect that whatever it is, is in the above list though!)
I think I just felt my paradigm shift.

2012 SL (One of the colors): 2-year lease, 2012+,
2015 S w/QC (A different color): 3-year lease, 2014+,
2017 SV (Same color as 2015 S): 3-year lease, 2017+, lower monthly than either above(!)

ericsf
Posts: 358
Joined: Tue Sep 07, 2010 4:33 pm
Delivery Date: 05 Mar 2011
Leaf Number: 0428
Location: San Francisco

Re: How to Check Battery Capacity, Degradation and Range

Thu Jan 30, 2014 8:30 pm

DougWantsALeaf wrote:What does the DTE stand for On the leaf spy?

In Nissan lingo DTE is Distance To Empty.
SL w/ QC (3/5/2011) - 11bars on 1/23/2014 @ 54k miles - 10 on 12/23/2014 @ 73k - 9 on 10/5/2015 @ 85k - 8 on 7/3/2016 @ 96k

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linkim
Posts: 495
Joined: Thu Dec 16, 2010 5:06 pm
Location: Silicon Valley

Re: How to Check Battery Capacity, Degradation and Range

Thu Jan 30, 2014 10:26 pm

Quote - Ordered : 9/2/2010 - SL w/ QC - Delivered : 3/5/2011 - 1st bar lost on 1/23/2014 @ 53700 miles.

ericsf - Do you have measurements of the Ah capacity of your LEAF when you lost the 1st bar?
LEAF SL + QC
Reserved: 4/20/10
Received: April 19, 1 year after reservation

flarend
Posts: 19
Joined: Sun Sep 15, 2013 6:25 am
Delivery Date: 15 Apr 2013

Re: How to Check Battery Capacity, Degradation and Range

Thu Feb 13, 2014 5:07 pm

I just found this thread and I've been concerned with my range and/or battery.
I have logged quite a few trips where I reset the dash readouts for each trip. Here is the data for a NEW 2013 with more between 800 miles and 3000 miles:
Starting SOC %, Ending SOC%, miles driven, mi/kWh, usable battery capacity
All at 5 temp bars
81% 5% 59.5 4.3 18.2
79% 3% 63.7 4.6 18.2
80% 48% 24.4 4.5 16.9
79% 9% 37.5 2.9 18.5
75% 5% 41.7 3.0 19.9
100% 74% 12.8 3.1 15.9
95% 8% 62.0 3.7 19.3

At 4 temp bars (some of these cases are using the climate control which explains the low mi/kWh)
73% 16% 34.9 3.4 18.0
100% 7% 58.9 3.2 19.8
91% 30% 50.6 4.7 17.6
100% 0% (T) 70.8 3.5 20.2
100% 19% 37.6 2.6 17.9
81% 29% 23.7 2.6 17.9
69% 39% 11.7 2.4 16.3
81% 70% 4.1 2.4 15.5

From this I conclude that for this type of test to be valid, you need to use up 'most' of the SOC, because all the times in which I drove just a short distance, the calculated capacitance was an outlier on the low side.
I also conclude that my battery capacity is only about 19 kWh or so which seems low by about 10%.

I have had the car into the dealer several times to have the range looked at and they say my numbers are normal and just what is expected. The corporate office instructs my local dealer to stop working on the car and return it to me as completely normal. They did do a battery usage report which gave me 5 stars and one three-star rating for "Long term parking with high state of charge". I don't do that. I have it on a timer and it charges in the wee AM to 80% usually, and sometimes to 100%. But I never charge to 100% and let it sit there.

So should my calculated capacity really be something closer to 21 or 22 kWh for a new car with a broken in battery, but not many miles? Am I unreasonable in thinking my battery capacity seems small?

Thanks

blimpy
Posts: 105
Joined: Mon Nov 03, 2014 12:36 pm
Delivery Date: 0- 0-2014

Re: How to Check Battery Capacity, Degradation and Range

Thu Nov 20, 2014 10:01 pm

Well Good God !

Here is a recipe for abusing your battery on both ends, all in hopes of find out if it is abused !



going to 100% is just about the worst thing you can do to your leaf battery.. as this really accelerates degradation
in the most effective way.

Maybe you've gotta do this torture test to get absolute numbers... but everything extreme you can to do these batteries ,
they just don't like, and you pay for the privilege in shortened life.

This is kind of like increasing the voltage on an incandescent bulb, or putting it in series with a high current load - to "find out what it will do"
Die.. is what it will do.

cycle them between 20 and 60 % and they will last well past their design life.

play around in the bottom and top 10% and they die very young.
2016 SV purchased 11/2/16 With Subsidies From Sonoma Clean Power, North Sonoma Air Pollution Control District, Evergreen, and State of California, and $15,000 in discounts from Jim Bone Nissan Santa Rosa California. :D Color Me GRATEFUL Long Time Coming !

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