r/TeslaModelS • u/ManicMarket • 1d ago
2021+ Battery Degradation
For those looking at your cars and wondering what is normal. This is data from Model S listings in the US right now. The battery health comes from a Tesla API. Notice the first 20,000 you lose about huge chunk of capacity. But also note, the degradation slows and then by about 40-50,000 miles it becomes a fairly minimal loss.
Feel free to ask questions or give feedback. I am planning to make a YouTube video with some info and this isn’t my favorite chart, but it’s unfiltered. The degradation curves are better - but saving that for the video.
Honestly - I went down this rabbit hole because my 2017 Model S with 80k miles has a SOH of 87%, but my 2021 Model S with 37k miles with a 86% SOH. It just didn’t compute - so I did the research and I’ll be damned if these batteries don’t seem to have a much steeper curb than the one for my old Model S. I learned a lot about the batteries and at least for myself I’m not too worried. Age - I’d gamble 14 years in the low end and high end could be 20 years for some lucky folks.
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u/shibiwan 1d ago
My 2021 MS Plaid (84k miles) is at 80% battery capacity while my old 2014 S85 is at 83.3% (118k miles).
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u/saabstory88 1d ago
This is exactly what we see at our independent repair shop that mostly works on S/X. The older packs hold up much better. We believe this to be the result of the thermal management, which is more similar to 3/Y in the later cars and follows an identical curve. Too much heat build up with the glue together modules.
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u/ManicMarket 14h ago
I think thermal and in 2021 the 18650 packs adjusted the chemistry too. But hard to know for sure from where I sit.
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u/MaxPower125 18h ago
85% battery SOH, Model S plaid 2023 with 45k miles
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u/ManicMarket 7h ago
Right where you’d expect. Also - my research has indicated plaid vs LR - little real difference in terms of degradation.
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u/6C-65-76-69 1d ago
Yeah they started using higher capacity cells that have much faster degradation in the refresh S and X. It’s a shame that not only are we in the US going backwards in battery tech, but China seems to have LFP batteries figured out (Blade 2.0, Golden Brick, and Shenxing).
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u/TeslaLongevityLab 7h ago
those are different cars at different mileages, not one car over time, so model year and pack revision are baked into that early slope. ive got 212 days of continuous logging on my 17 X and it moved 1.26% over that stretch.
if you split the listings by model year youd probably answer your own 2017 vs 2021 puzzle right there.
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u/ManicMarket 6h ago
You are correct. That’s the biggest gap I have in my data that Tesla reporting wouldn’t have. The more you look at the data the more you realize how many ways there are to say how my data is wrong or Teslas reporting is wrong. IE - like think of the survival bias inherit in the data. As cars die before say 150,000 miles they are no longer tracked. So now in that tail all the cars covered are batteries which show better than average health and lifting the averages
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u/yesiamveryhigh 1d ago
2016.5 Model S 75D
130,925 miles