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1% degradation after 51k miles on 85 B pack

Discussion in 'Model S' started by JPUConn, Oct 8, 2016.

  1. JPUConn

    JPUConn Member

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    IMG_6441.jpg

    Heading out on a 240 mile round trip drive today and just range charged.

    My car is a CPO S85 and when purchased in June at 46k miles was showing 260 at 100%. I don't know how the prior owner treated the battery but do know my battery and drivetrain are original to the car with a B pack battery.

    Now at 51k and it's reading 262 ratedThat's just over 1% degradation in 51k miles / 3.5 years!
     
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  2. theslimshadyist

    theslimshadyist NashVegas!

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    That's very reassuring and thanks for sharing.
     
  3. JPUConn

    JPUConn Member

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    Nice scenic fall drive to a family get together with no real range anxiety (or I'm just crazy).

    Stats for the trip:
    IMG_6469.jpg

    On the way to our destination I was conviently following a charter bus and managed some very nice efficiency. After the bus parted ways there was an 18 wheeler not far off to help.

    IMG_6443.JPG

    My "hypermiling" adventure stopped when we happened to be a few miles from the Auburn, MA supercharger on our route and one of the kids needed a diaper change. That 10 minute diaper change (can't just take one of the 3 kids out of the car) added 27 miles of blissful buffer. After that the ac went on, speed increased by ~10 mph, displays no longer dimmed, and range mode off.

    While at my destination I plugged into an outlet to sip a 10 more buffer miles. The downside was folks new to Tesla asking and assuming that I need to plug in any time I park the car but the payoff was being able to enjoy the drive home and not worry about efficiency. Arrived home with 14% left on the pack.

    IMG_6470.jpg
     
  4. FlatSix911

    FlatSix911 918 Hybrid

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    What app are you using?
     
  5. JPUConn

    JPUConn Member

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  6. AMPd

    AMPd Active Member

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    Hyper milling and 18 wheeler? You're brave!
    The amount of debris their tires kick up makes me stay far away from them.
     
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  7. Sharkbait

    Sharkbait Member

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    #7 Sharkbait, Oct 8, 2016
    Last edited: Oct 8, 2016
    I agree. I understand the whole hyper milling thing but not worth all the road debris kicking up. I would be curious about charging technique and best practices for charging. I'm only charging to 90% presently.
     
  8. eye.surgeon

    eye.surgeon Member

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    That doesn't mean anything in reality. The displayed range is by no means accurate enough to determine battery degradation. You're measuring millimeters with a yard stick.
     
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  9. walla2

    walla2 Member

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    914.4 mm in that yard stick.

    What number would you propose us use since we don't have immediate access to better numbers? I'd say his pack is pretty healthy overall.
     
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  10. JPUConn

    JPUConn Member

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    Roads were clear and dry, and my car came with some rock chips already so a few more won't bother me.

    I often charge to 80-90% depending on planned activity. My soc is typically between 40-80%.

    Range charges and using the majority of the available pack energy is an exception as I have destination charging options at my most common distance locations.

    I too would like to understand if there are better practices - is it better to range charge to make it back vs supercharge mid trip?
     
  11. eye.surgeon

    eye.surgeon Member

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    #12 eye.surgeon, Oct 9, 2016
    Last edited: Oct 9, 2016
    You can't. Not determinable by the end user without deep access to pack analysis and testing.
     
  12. bkp_duke

    bkp_duke Member

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    You sure the previous owner didn't get a pack replacement?

    I have two 2013 cars with 85kWh B packs, one with 13k miles and one with 37k miles. Degradation on those are 2.5% and 4.9%, respectively.
     
  13. JPUConn

    JPUConn Member

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    Asked the service manager and he pulled my cars info and the B pack and drivetrain are original to the vehicle with no work done to them.
     
  14. bkp_duke

    bkp_duke Member

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    Quite the gem then.
     
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  15. eye.surgeon

    eye.surgeon Member

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    [​IMG]
     
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  16. Cyclone

    Cyclone Active Member

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    Sweet. My 2013 with 52k miles gives me 263 miles at a 100% charge. Good to know there are other well-kept battery packs out there like mine!
     
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