pyromancy5
Posts: 68
Joined: Mon Apr 03, 2017 6:17 pm
Delivery Date: 01 Apr 2017

SoH dropping fast

Fri Jun 30, 2017 7:11 am

So I've owned my car since the beginning of April. I've driven roughly 1700 miles and since I first checked my SoH at 82% now I am down to 80%. Should I be concerned about this fast of a drop in batt health?

DaveinOlyWA
Gold Member
Posts: 12052
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: SoH dropping fast

Fri Jun 30, 2017 7:23 am

no
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 (build 10/2016)"low water marks" 24,261.3 miles.363 GIDAhr 80.66Hx95.95%kwh28.1QCs205,L2's 226
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

pyromancy5
Posts: 68
Joined: Mon Apr 03, 2017 6:17 pm
Delivery Date: 01 Apr 2017

Re: SoH dropping fast

Fri Jun 30, 2017 7:58 am

I know this is a short period of time to track data. But if one looks at 35k miles and a drop of 18% batt health, it works out to 1,944 miles per 1% drop in SoH.

Since I've owned the car, it seems to have accelerated to twice that. Will batt degradation speed up as the car ages?

(2014 SL)

DaveinOlyWA
Gold Member
Posts: 12052
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: SoH dropping fast

Fri Jun 30, 2017 9:18 am

pyromancy5 wrote:I know this is a short period of time to track data. But if one looks at 35k miles and a drop of 18% batt health, it works out to 1,944 miles per 1% drop in SoH.

Since I've owned the car, it seems to have accelerated to twice that. Will batt degradation speed up as the car ages?

(2014 SL)


Yes. lower SOH means more charge cycles per mile driven, greater resistance to current flow, etc.
Last edited by DaveinOlyWA on Sat Jul 08, 2017 8:27 am, edited 1 time in total.
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 (build 10/2016)"low water marks" 24,261.3 miles.363 GIDAhr 80.66Hx95.95%kwh28.1QCs205,L2's 226
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

Aussie
Posts: 98
Joined: Wed Oct 28, 2015 10:30 am
Location: Dallas

Re: SoH dropping fast

Fri Jul 07, 2017 6:47 pm

Battery stats seem to be very dependent on driving / charging cycles. Short commutes and irregular / small charges seem to be detrimental to statistics. Long driving and full charging seem to be beneficial to statistics.

I used to have an 16 mile round commute and charged to 80% every 2nd night. Then swapped cars with my wife whose 32 mile + decent lunch trips resulted in a fairly regular 20% - 80% daily charging cycle. My battery gained over 2Ahr in a month.

Whether these statistics actually represent underlying conditions is unknown and I would suggest unlikely.

pyromancy5
Posts: 68
Joined: Mon Apr 03, 2017 6:17 pm
Delivery Date: 01 Apr 2017

Re: SoH dropping fast

Sun Jul 09, 2017 7:49 am

Thanks for that Aussie, I have a 7mi round trip commute and we run most errands in my car as well. I charge twice a week. Maybe one top off in there as well but I do my best to run it down to at least 20% before charging again thought not always. I also charge to 100%. With a 2014, I don't believe I have the ability to limit the charge consistantly to 80%.

DaveinOlyWA
Gold Member
Posts: 12052
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: SoH dropping fast

Sun Jul 09, 2017 8:34 am

pyromancy5 wrote:I know this is a short period of time to track data. But if one looks at 35k miles and a drop of 18% batt health, it works out to 1,944 miles per 1% drop in SoH.

Since I've owned the car, it seems to have accelerated to twice that. Will batt degradation speed up as the car ages?

(2014 SL)


A somewhat related comment to your situation...

http://daveinolywa.blogspot.com/2017/07 ... -cuts.html
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 (build 10/2016)"low water marks" 24,261.3 miles.363 GIDAhr 80.66Hx95.95%kwh28.1QCs205,L2's 226
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

pyromancy5
Posts: 68
Joined: Mon Apr 03, 2017 6:17 pm
Delivery Date: 01 Apr 2017

Re: SoH dropping fast

Thu Oct 12, 2017 5:50 am

So, with an in-service date of 5/2014, 38K mi on the clock, and 78% SOH, I have 18+ months left on the battery warranty. In 6 months/ 4k miles i have dropped from 82% to 78%. Still have 11 bars.

This car lived it's first 30k miles/ 3 years in GA.

What do you think my chances of dropping 3 more bars in a year and a half?

SageBrush
Posts: 1210
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: Colorado

Re: SoH dropping fast

Thu Oct 12, 2017 6:42 am

Your 11th bar should drop any day now. The next two bars are worth about 13%
Will you lose 13% in 18 months ? Maybe. Depends a lot on your locale.
2013 Model 'S' with QC & rear-view camera
Bought off-lease Jan 2017 from N. California with 63.9 Ahr after 22k miles
Car is now enjoying an easy life in Colorado

powersurge
Posts: 714
Joined: Wed Oct 21, 2015 10:24 am
Delivery Date: 06 Dec 2014
Location: Long Island, NY

Re: SoH dropping fast

Thu Oct 12, 2017 9:10 am

I have always heard that the batteries like to be at 50 % charge. I have also always thought that draining down to 20% before charging results in a greater strain than recharging at 40-50%????

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