Possible 35% battery degradation after 57k miles?

[gt2690b]

True, but removing it or disconnecting and disabling it through software has the same effect. They are not doing it for our benefit IMO.

disabling through software is not the same effect if it is still using 10w

 

[Azlaneguy]

New data with no Sentry or other "vampires", headlights off, AC on:
- 26 kWh corresponds to 47% battery drop (80% -> 33%) => max charge = 26 / 47 * 100 = 55kWh == 73% of new battery (75kWh)... is 27% capacity drop over 57k miles normal and expected !?
- unrelated: 408 Wh / mile average over 65 miles round trip with little traffic - not sure where all this energy goes

Battery warranty is minimum of 70% while in warranty period. 4% more and they have to replace. Did you test in service mode?

 

[vcor]

408 Wh/m is very high. My lifetime average on my 2016 75S was 330 Wh/m and it is less efficient than a 75D and I don't normally strive for optimum conditions.

Driving things that could cause this high drain:
- High Speeds
- Hard acceleration (and often new owners do this as it's so much fun)
- Hard braking (which doesn't use much regen)
- Headwinds
- Cold or hot weather (although less of a factor)
- Rain/Snow (causes more friction)

Items that have little effect:
- Radio/Music
- Headlights

Technical issues:
- Bad wheel bearings (higher friction)
- One of two motors dead (you'd get major warnings)
- Lack of low-rolling resistance tires (LRR tires are normal, but perhaps someone replaced them with non-LRR tires)
- Under inflation of tires (but above the point of a warning)

 

[ucmndd]

Battery warranty is minimum of 70% while in warranty period.

Not for a 2018 Model S it isn't. That car has no battery capacity warranty/guarantee whatsoever.

4% more and they have to replace. Did you test in service mode?

I guarantee you Tesla's capacity measurement is very different than OP's extrapolated math.