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Greater than normal battery degradation?

Discussion in 'Model S: Battery & Charging' started by Drlev, Dec 27, 2018.

  1. Drlev

    Drlev Member

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    I have a Nov/Dec 2017 Model S 75D with almost exactly 17,000 miles. I’ve noted that in the last 2,000 miles my 100% has dropped down to 242 miles from 253 (and 257 when new). This is more than 5% degradation. I’ve been keeping the batteries fairly well balanced due to needing to charge to 100% about once every month or two for longer road trips. I charge daily to about 80%, which has dropped from 203 down to 194. I know it’s winter now, but it seems like a big drop.

    Thoughts/reassurance? Am I nuts?
     
  2. N..8

    N..8 Member

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    I have a Dec 2017 S75 with 13k and I'm down to 237 from 244. If you have TM-spy it would be nice to see what your Pack is sitting at. I know mine is 71kw down from 72.6 when new.
     
  3. Drlev

    Drlev Member

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    I’m sitting at 69.2 kWh.
     
  4. N..8

    N..8 Member

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    #4 N..8, Dec 27, 2018
    Last edited: Dec 27, 2018
    I would say just watch it, I will sometimes drop to 69.8 if not at 90% but the battery really hasn't loss any since 6k miles. You're mileage is 4k over mine so who knows what that will do to my pack.

    I've only supercharged 31 times, not sure if this factors into your charging patterns.
     
  5. Lasttoy

    Lasttoy Active Member

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    I have 130k on my S. I have 2 settings, Local 75% is about 175mile. Going on long trip, 90% 235miles. I have supercharged all over USA.
    There are too many variables to figure out your degradation. Temp, altitude, etc.
    Dont worry about it till your car is broken in. :).
     
  6. Buster1

    Buster1 Member

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    You simply CANNOT determine battery pack health and degradation by reading the rated mileage at various charge levels.
     
    • Like x 2
  7. N..8

    N..8 Member

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    I meant to type 70.8 not 69.8
     
  8. Car Captain

    Car Captain New Member

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    Belfast, ME
    My Model S is 2014 P85D, 50k. New to me. Just let it charge to 100% first time, it stopped at 93%. Does this mean it has lost 7%? Also, I’ve had the charge limit set to 90% is this right?
     
  9. TexasEV

    TexasEV Well-Known Member

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    To the first question, no, when you set at 100% charge it should charge to 100%. The relevant info is what rated range does it show at 100%. To the second question, yes set to 90% charge routinely and 100% for trips. Others may tell you less (70 or 80%) for theoretical reasons of “being better for the battery” but there’s not been significantly more degradation after five years at 90% than at lower states of charge.

    I don’t know why your car stopped short of the percentage charge you set.
     
  10. Car Captain

    Car Captain New Member

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    Thank you. This helps a lot. Happy motoring.
     
  11. Car Captain

    Car Captain New Member

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    Right. So: toggling back and forth between display in distance vs. energy, now at 95% and 235 mi. 235 / 0.95 = 247 mi. That's out of rated 253 mi. We've lost only 2.3% or 6 mi of battery capacity in 4 years and 50k miles. Not bad.
     
  12. SSedan

    SSedan Active Member

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    So a bit over a year ago when I bought my P85 with 65k on it full was 257/8 down from 265new over the last year and change of shallow doschadis and charging to 70-80% 100% dropped to 237/8 so I drained it down to 7% and charged to 100% and it rebounded to 243. Going to try a few more cycles as schedule allows.
     

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