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teslafi battery degredation report

seems reasonable except for the 'trend line'

>85% charges
Capture.JPG


>50% Charges
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& this is just looking at the max range in the Teslafi data(started using it 11/16)
upload_2018-5-2_15-6-22.png
 
Last edited:

SSonnentag

埃隆•馬斯克
Apr 11, 2017
1,819
2,455
Arizona
Yeah, I see the same thing with my trend line, although I only have a few months worth of data to work with. I put the data into Excel and used its trend line, which fits the data better, but doesn't necessarily reflect reality either. :D

teslafi.png




Here is the Excel graph with trend line:
excel.png
 

jdw

Member
Supporting Member
Jun 1, 2015
720
1,491
Vancouver
I had one range mode charge in the mix, which became my "high range". This created the slope line showing degradation that isn't really there ...it would be good if you could select or filter the charges you wanted to include to omit range charges and also to select charges that were exactly 90% instead of 90% or above.
 
The Teslafi guys are data gurus, but the average lines do look funny. My "high vs low" drop was 1.7%, but the "high vs current" was 0.0%. I've had the car less than a year, and I suspect the "high vs low" is reflecting a difference in ambient temperatures over the winter (and much-colder-than-average March and April) more than actual battery degradation. Now that we finally are seeing some near-average spring temps, my range at 60% charge is exactly where it was when the car was new, early last summer. Because of seasonal variations, I don't think these degradation numbers will be very meaningful until a car has a couple of years of data points.
 
D88479C7-0363-45B1-BBDD-E21F59BE9E44.jpeg
Attached is my report. ~22 months of data for my 75 X. 20k miles. The slope at ~15 months in is consistent with me thinking “oh, this latest update is more aggressive with long term battery protection and that’s why Tesla is decreasing my capacity”. It does also coincide with winter but 1) my car is garaged and my garage temp is fairly consistent year round and 2) this past month has been unseasonable warm and there has been no change.
 
My car was a CPO and it was in service for 41 months prior to me owning it. I know I'm not anywhere close to qualifying, but at what point does Tesla say a battery is in need of a warranty replacement vs it being "normal degradation"? 11 miles in a little over a year is more than I would have hoped to see.... especially since it hadn't lost that much in the nearly 3.5yrs combined before I got it. I mean, hell, at this rate in two more years, I'll be struggling to drive to/from CA without more SC's being installed in AZ.

Capture.PNG
 

David99

Well-Known Member
Supporting Member
Jan 31, 2014
5,028
7,983
Nomad (mostly US)
My car was a CPO and it was in service for 41 months prior to me owning it. I know I'm not anywhere close to qualifying, but at what point does Tesla say a battery is in need of a warranty replacement vs it being "normal degradation"?

The warranty does not cover degradation. It's up to them to give you a replacement battery or not. A few people got one (you don't get a new one, you get one that has the same or better range) but they had more serious issues. Other than Tesloop, I don't know anyone that got a replacement battery due to degradation
 
The warranty does not cover degradation. It's up to them to give you a replacement battery or not. A few people got one (you don't get a new one, you get one that has the same or better range) but they had more serious issues. Other than Tesloop, I don't know anyone that got a replacement battery due to degradation
I know it doesn't cover degradation. That wasn't what I was asking. At what point does Tesla consider it to be a problem with the battery and NOT normal degradation.
 

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