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does battery degradation plateau, or is it more straight-line, or what is the shape of the curve?

Discussion in 'Model S: Battery & Charging' started by syswei, Aug 4, 2016.

  1. syswei

    syswei Member

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    I have a 70D with 2k miles on it in about 6 weeks. It was getting 211 miles range (at 90%) but is now down to 208. Losing 3 miles isn't a concern, but if degradation continues at anywhere near this rate, I'm definitely concerned about how things will look at 40k or 80k miles.
     
    • Like x 1
  2. Max*

    Max* Charging

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    [at 90% SOC] My 70D started at 214-218, within a few weeks I was around 212-214, then shortly after down to 208-210, and it stabilized at 208. A year later (25k miles driven in that year), I'm still at 208.
     
  3. TampaRich

    TampaRich Member

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    At 10K miles I'm hitting 212-214 on a regular basis with my 70D, 52 mile commute, charging every third day. I wanna say that I started at 220 when I took delivery 9 months ago.
     
  4. TexasEV

    TexasEV Well-Known Member

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    Degradation is more in the first year and then slows down to about 1% per year. My 3 year old 60 starred at 208 and is now at 200.
     
  5. jaguar36

    jaguar36 Active Member

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  6. Rifleman

    Rifleman Now owns 2 Model S's!!!

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    You are doing better than my 2014 S60. I am at 187 @ 100%. My wife's 2013 S60 is still at 198 @ 100%. Both of us are around 40k miles.
     
  7. Petra

    Petra Member

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    I picked up my 70D about nine months ago and, at the time, my 100% showed 238 rated miles and 90% was 215 rated miles. 9k miles later and my 90% is still between 213 and 215 miles and 100% still comes up to 238 miles.
     
  8. ran349

    ran349 Member

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    I have a 14 month old 70D with 20k miles and my 90% is around 205. Most of the drop came very early on and for the last 6 months it has barely changed. Hopefully, you will see the same leveling off.
     
  9. Vince Cobelo

    Vince Cobelo Member

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    Just want to compliment the OP on a good question. I have been wondering the same but haven't been able to quite articulate how to ask the question.
     
  10. Morristhecat

    Morristhecat Member

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    I can only speak of my experience, but I found in the 1st 3 months there was quite a bit of degradation in my S60. If I recall correctly I think I started out with about 324km at 100%. After about 3 months it went down to 320km. Now after 3.5 years I can still achieve 320km as long as I balance the pack out about 2 times prior to a 100% charge. I find I only need 100% very rarely though, and I regularly charge to 80% most of the time. I think that the key for long battery life is to only charge to 80%, keep it above 25% on a regular basis. 90% is fine too, as recommended by Tesla, I just side on safety.
     
  11. Matteo

    Matteo Member

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    Hi,

    This is how the curve looks like. You can add your data to the same survey HERE.

    [​IMG]
     
    • Like x 1
  12. syswei

    syswei Member

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    Thanks, everyone. I didn't expect to see an actually line, as Matteo kindly posted, when I asked the original question!
     

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