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Unable to charge to 100%

Discussion in 'Model S' started by SDRick, May 6, 2017.

  1. SDRick

    SDRick Member

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    I set last night's overnight charge to 100%, but charging stopped at 97%. It did a similar thing last time I tried a full charge as well. Any idea what's going on or how to rectify?
     
  2. oktane

    oktane Active Member

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    Battery degradation
     
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  3. msnow

    msnow Active Member

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    Happens to me all the time when I let it get below 20% then do a 100% charge. It ALWAYS recalibrates to 100% so don't worry.
     
  4. Canuck

    Canuck Active Member

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    Happens to me too. You will get back to 100%.
     
  5. SDRick

    SDRick Member

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    What do I need to do to get back to 100%?
     
  6. Hugh Mannity

    Hugh Mannity Mediocre Member

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    Set your charge to 100% and it'll work its way back there after a few more charge cycles.
     
  7. SDRick

    SDRick Member

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    Does charging to 100% help balance the cells in the pack?
     
  8. Hugh Mannity

    Hugh Mannity Mediocre Member

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    Assume the answer is yes since I believe balancing happens above 95%?

    The far more enlightened folk here will correct me if wrong.
     
  9. gaswalla

    gaswalla P4201/85/airsusp/pano/19i

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    yes, balancing occurs when you charge to 100% (probably above 93%, if I recall)
    no screen shots, or details from op.. so, this is my hypothesis: the car did charge to 100%, then rebalanced and by the time he/she went to car, the car was indicating 97%: a combination of rebalancing and phantom losses.
    Advice: activate the notifications on your mobile app, so that you get notifications when the car starts charging and is completed: you will get a notification with time of charge completion and % or miles present when charge completed. Sounds like battery needs balancing, so charge to 100% for three consecutive times (2 more times)...
    Please report back with your findings
     
  10. nagypite

    nagypite Member

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  11. Hugh Mannity

    Hugh Mannity Mediocre Member

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    In Bjorn we trust
     
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  12. SDRick

    SDRick Member

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    I do receive notifications as charging completes. I was notified with Charging Complete 97%.
     
  13. BrettS

    BrettS Member

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    I think this just happened to me too. I got my 2015 model S about a month ago and had only charged it to 90%. I had read posts about balancing the cells by charging to 100% occasionally and that it wasn't too bad for the battery if you didn't leave it at 100% for long. So, since I needed to make a long drive yesterday I decided to go ahead and charge to 100% for the first time. I checked it about 1 hour after the charge had completed and was pretty surprised to see it at only 98%. I wasn't sure if it had actually charged to 100% and then lost 2% in an hour (which seemed pretty unlikely) or if it only got up to 98%, but I guess it was the latter. I have another longish drive tomorrow, so maybe I'll do another 100% charge and see if it actually gets to 100% this time.
     
  14. tpham07

    tpham07 Member

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    "balancing" only affects what the range shows up on the display since its software. It does not affect the usable power capacity of the battery. addressed by Tesla already.

    Tesla Battery Range Degradation
     
    • Informative x 1
  15. jeffro01

    jeffro01 Active Member

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    Um... No... Try again...

    Obviously what's going on has already been covered...

    Jeff
     
  16. oktane

    oktane Active Member

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    Battery degradation 97 is the new 100
     
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  17. jeffro01

    jeffro01 Active Member

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    Don't be obtuse... It's not battery degradation at all it's balancing and how the BMS handles that...

    Jeff
     

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