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Range Degradation, Sentry Mode, Deep Discharge Trips

I am wondering

  • Whether to take it on a long trip to reset the calibration

    Votes: 0 0.0%
  • Heavy usage of sentry mode has played a role in the loss of calibration

    Votes: 0 0.0%

  • Total voters
    2

thor_2019

Member
Jul 5, 2019
58
103
Vancouver, BC
FusionCharts.jpg

Long Range Dual Motor HW3 990 motor
4/21 Birth Date, 5/1 Delivery with 6 kms

Since new my maximum range when charged was 497 of 499 km. All my trips have been short as has the depth of discharge of the battery pack, rarely being below 50% less than 10 times. I've played with daily charging @ 80% mostly. I've only taken 4 trips at 400 km and 1 trip at 225 km, only charging to 100% those times and leaving immediately when the charging was complete. Supercharging 4 times, on the 400 km trips charging from about 30%-60% (30% added, 12 mins per cycle 141 kW peak). Probably could have made it without supercharging but the range anxiety gets to me, plus I have free credits to use up.

Right now I have a 2.5% battery degradation after 10k kms and 4 months. The last long trip was between 7.5k km and 8.8k km. As you can see my range improved at this time, The first long trip was 6 km to 1200 km (picked up the car and went for a drive!)

I've used sentry mode everywhere besides my Home (in garage), mostly used while parked at work 8.5h per day M-F

I am wondering;

A) Whether to take it on a long trip to reset the calibration

B) How much heavy usage of sentry mode has played a role in the loss of calibration

C) Or is my battery actually degrading, or have a problem.

I believe I have done everything I can to prevent degradation but this is not looking good.
 

ewoodrick

Well-Known Member
Apr 13, 2018
5,285
3,735
Buford, GA
A) Maybe read some of threads with the same issue
B) Looks like a software update
C) Stop worrying about it. It's not even that much
D) Leave it at 100% for a few hours, it doesn't hurt the batteries, allows them to equalize and reset a little better
E) Stop worrying about it.
 

darth_vad3r

Well-Known Sith
May 6, 2019
1,574
1,126
Canada
A) Maybe read some of threads with the same issue
B) Looks like a software update
C) Stop worrying about it. It's not even that much
D) Leave it at 100% for a few hours, it doesn't hurt the batteries, allows them to equalize and reset a little better
E) Stop worrying about it.

I agree with all that except you should leave it plugged in at 90% after charge complete for a few hours to help calibration is what I have heard people say Tesla is telling them lately. Not 100%.

Also 100% isn’t good for the battery. So kinda by definition that’s “hurting” the batteries. It may be a slow death from a thousand cuts ... but you can’t say a cut doesn’t hurt. You can say a cut won’t kill you, but it still hurts.
 

darth_vad3r

Well-Known Sith
May 6, 2019
1,574
1,126
Canada
played with daily charging @ 80% mostly.
[…]
A) Whether to take it on a long trip to reset the calibration
B) How much heavy usage of sentry mode has played a role in the loss of calibration
C) Or is my battery actually degrading, or have a problem.

I believe I have done everything I can to prevent degradation but this is not looking good.

It’s looking fine. It’s probably calibration.

D) Ignore it and see if it gets better because it’s probably just calibration and not degradation
E) if you can’t ignore it, charge to 90% for a while instead of 80% (like weeks or more) to see if calibration improves. 80% is better for actual battery health though. 90% is just better for calibration and making you feel better about your degradation anxiety.
 

ewoodrick

Well-Known Member
Apr 13, 2018
5,285
3,735
Buford, GA
I agree with all that except you should leave it plugged in at 90% after charge complete for a few hours to help calibration is what I have heard people say Tesla is telling them lately. Not 100%.

Also 100% isn’t good for the battery. So kinda by definition that’s “hurting” the batteries. It may be a slow death from a thousand cuts ... but you can’t say a cut doesn’t hurt. You can say a cut won’t kill you, but it still hurts.


It is absolutely, positively safe, even recommended by Tesla to charge to 100% for trips. If it wasn't then why wouldn't Tesla just limit the battery to 90%?
 

darth_vad3r

Well-Known Sith
May 6, 2019
1,574
1,126
Canada
It is absolutely, positively safe, even recommended by Tesla to charge to 100% for trips. If it wasn't then why wouldn't Tesla just limit the battery to 90%?

I didn’t say it wasn’t safe. I said it hurts the battery.

If 100% didn’t hurt the battery, why does Tesla suggest only using 100% for trips, and not for daily use as well?

Tesla doesn’t “recommend charging to 100% for trips”. They recommend “only charging to 100% for trips”.

There’s a distinction.
 

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