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Re: 2015: Battery Data Report @ 100% Charge

Posted: Fri Nov 09, 2018 11:48 am
by philip
Being in Texas, heat will be the largest factor that shortens battery life. If you are okay with only charging to 80%, then keep doing it, it won't hurt anything.

The following paper shows that a lower charge voltage is better for longevity than a higher one (even if slight): https://www.researchgate.net/publicatio ... Assessment). The data they present show that the batteries that were cycled from 100% SOC had accelerated capacity loss when the battery was new, but eventually the degradation follows the same rate as those batteries that terminated charge at 85% on Page 7. They speculate that this initial rapid degradation may have been caused by overcharging early in the tested batteries life, but they don't have data on that. When they adjust that early degradation out, it shows only a couple % difference in degradation between the 100% charged and 85% charged batteries that had the same DOD after many cycles.

According to the data presented, there will be a slight advantage to maintaining a lower SOC as far as battery lifetime. So slight, that you may get an extra month or two of life out of the battery over a five year battery lifetime.

I suspect for my use case (and probably yours), being in a warm climate, that charging to 80 vs 100 will make very little difference in the total lifetime of the battery.

Re: 2015: Battery Data Report @ 100% Charge

Posted: Sun Nov 11, 2018 7:28 pm
by tattoogunman
philip wrote:Being in Texas, heat will be the largest factor that shortens battery life. If you are okay with only charging to 80%, then keep doing it, it won't hurt anything.

The following paper shows that a lower charge voltage is better for longevity than a higher one (even if slight): https://www.researchgate.net/publicatio ... Assessment). The data they present show that the batteries that were cycled from 100% SOC had accelerated capacity loss when the battery was new, but eventually the degradation follows the same rate as those batteries that terminated charge at 85% on Page 7. They speculate that this initial rapid degradation may have been caused by overcharging early in the tested batteries life, but they don't have data on that. When they adjust that early degradation out, it shows only a couple % difference in degradation between the 100% charged and 85% charged batteries that had the same DOD after many cycles.

According to the data presented, there will be a slight advantage to maintaining a lower SOC as far as battery lifetime. So slight, that you may get an extra month or two of life out of the battery over a five year battery lifetime.

I suspect for my use case (and probably yours), being in a warm climate, that charging to 80 vs 100 will make very little difference in the total lifetime of the battery.
Yeah, that was sort of what I was thinking, but I obviously want to mitigate it as much as possible. Given my limited driving, I could probably get away with 60%-70% SOC for my daily driving (gives me a bit of a buffer just in case). I'm already noticing the cold making an impact on range over the last few days since it's dropped into the 30's and 40's, so I feel more comfortable with 80% (+/-).

Re: 2015: Battery Data Report @ 100% Charge

Posted: Sun Nov 18, 2018 1:37 pm
by tattoogunman
Lost my first bar today at around 82.07% SOH and three weeks of ownership :( I'm still under warranty until 2020, so the faster the better probably :)

Re: 2015: Battery Data Report @ 100% Charge

Posted: Fri Jan 04, 2019 4:46 pm
by evtifosi
Latest Numbers From Jan 2019:

SOC=93.6%
AHr=52.93
SOH=85.24%
Hx=74.40%

ODO=11,008 mi

Might be getting close to the magic bar loss zone - not that bad for 3+ years I guess...

Re: 2015: Battery Data Report @ 100% Charge

Posted: Sat Jan 12, 2019 8:59 pm
by cwerdna
Relayer1956 wrote:I finally lost the 3rd bar yesterday 1/27/18. My 2015 Leaf SL stats were:

Mileage: 45,575
kWh: 15.4
SOC: 96%
GIDs: 199
SOH: 69%
Hx: 43.84%
Ah: 43.0

So I’m on track for a warranty battery replacement in 2018.
Did you end up losing your 4th bar yet?

Re: 2015: Battery Data Report @ 100% Charge

Posted: Sat Jan 12, 2019 10:12 pm
by Relayer1956
Actually I did just a few days ago on 1/7/19. I've been meaning to post about it.

Mileage: 52,722
kWh: 14.1
SOC: 96.6%
GIDs: 182
SOH: 63%
Hx: 34.75%
Ah: 39.22

Re: 2015: Battery Data Report @ 100% Charge

Posted: Sat Jan 12, 2019 10:15 pm
by cwerdna
^^^
Thanks!

Re: 2015: Battery Data Report @ 100% Charge

Posted: Sun Jan 13, 2019 10:01 am
by evtifosi
This was not a good week for our Leaf...

We finally lost the first bar - like I thought would happen - right about 11,050 miles and 3 years, 3 months of ownership.

We also were side swiped in a parking lot on the rear bumper which left some scratches and gouges in the bumper cover...and they didn't leave a note or anything.

Plus, we hit a curb and gouged up one rim a little...

Re: 2015: Battery Data Report @ 100% Charge

Posted: Sat Feb 02, 2019 8:47 pm
by mwalsh
Lost bar 12 on my warranty replacement pack today. 3 years one month, and probably 22,000 miles. Was too harried today to get numbers for you, but will try tomorrow or Monday.

That's about 8 months more than it took on the old pack to lose the first bar, but about 10k fewer miles (my driving needs changed substantially coincidental with getting the new pack).

Re: 2015: Battery Data Report @ 100% Charge

Posted: Wed Mar 27, 2019 10:51 am
by ixnay
2nd Owner on 2/2015 Leaf; 28,507 miles; First full charge, using L2 at home, was last night.

Gids SOC AHr SOH Km
271 970853 578772 93.2 45878

At purchase 3 weeks ago, SOH was 95.18.