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Understanding battery charge - help

Discussion in 'Model S: Battery & Charging' started by webcrawler, Aug 26, 2018.

  1. webcrawler

    webcrawler Member

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    #1 webcrawler, Aug 26, 2018
    Last edited: Aug 26, 2018
    Experts, Is there anything this picture can reveal about battery health?

    Or what's the best we can understand from here? Is dotted line 90% charge line or 80% ?

    Its a Model S 70D, based on this how much total charge battery can hold?

    Thanks
     

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  2. ucmndd

    ucmndd Active Member

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    Dotted line is 90%. If you assume the car is charged to 88%, that works out to 225 miles at 100%. 70D was rated for 240 miles new, so that’s about 6% degradation.

    Assume it’s currently at 87%, that’s 228 miles at 100% and 5% degradation. Either are reasonable values.
     
  3. webcrawler

    webcrawler Member

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    thank you. Just to be clear, its 2015 Model S 70D at 36k miles. So 5-6% degradation is acceptable within 3 years?
     
  4. ucmndd

    ucmndd Active Member

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    Generally yes. How many miles?
     
  5. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

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    The screen numbers are only an estimate. The only real way to check is to charge fully and drain fully. However, this is very hard on the battery, so it's recommended you don't do it. Also it's best to use Ideal miles for degradation estimates rather than Rated miles because Tesla seems to mess with Ideal miles less. Temperature is also a factor as the battery stores more in warm weather than in cold weather.
     
  6. webcrawler

    webcrawler Member

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    36K miles. thoughts? acceptable or I shall find another car?
     
  7. ucmndd

    ucmndd Active Member

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    I don’t see anything particularly concerning or out of the ordinary based on the info at hand.
     
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  8. SSedan

    SSedan Active Member

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    Most seem to find depredation plataues areoind that level so nothing alarming about it.
     
  9. webcrawler

    webcrawler Member

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    thank you all!
     
  10. Lasttoy

    Lasttoy Member

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    U move the dotted line. Mine is 175 at home. Moved to 240 leaving on long trip.
     

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