Teslafi battery degradation report

[philgods]

Are the numbers to be believed on the teslafi battery report?
Apparently my battery range has got better since I got my M3P in March - after 3000 miles my range is 310.4 (101.4%). I thought it was supposed to drop off over the first year?

 

[MrBadger]

Depends on what setting's you use - it will be more accurate if you don't use the option for partial charges. A 1% change in battery charge state is around 3 miles on a LR battery, so you are working to those sorts of tolerances on a partial charge - it doesn't know if battery is 80.0% or 80.9% when charge completes.

But its not really a degradation report, it a report on the estimate range the car thinks it has then extrapolated to 100% charge. Estimating range from a lithium battery is an inexact science, so its not going to be exact, but trend is possibly useful.

Also, if comparing with fleet cars, I found that you need to be more tight with comparison settings (temperature and mileage) than the defaults.

 

[philgods]

..it doesn't know if battery is 80.0% or 80.9%..

Well that's key to know. 1-2% here or there probably insignificant then?

 

[Mr Miserable]

Temperature has an effect.