Source
r/RealTesla•
FaeLLe

90 kWh battery packs how to estimate degradation and maximum miles capacity

OWNER EXPERIENCE

So my brother has an older 2017 Model S 90D and we were trying to understand we can actually determine whether the performance of the battery is still what it should be?

The maximum range at 85% of battery (two notches below the maximum on the charging slider) is around 213 miles, is that good? What is the formula that needs to be used to calculate please? I am in UK so appreciate any specific guidance if possible.

Thanks for your time!

Posted Feb 5, 2021, 5:40 AM UTC

79
dcmix5•

I have no idea but there are some threads here to hold you over until some replies come in:

https://teslamotorsclub.com/tmc/forums/model-s-battery-charging.109/

5
Mori42•

Tesla has changed the factor for the range calculation with firmware updates, so it's not a good indicator of degradation.

Take a look at Scan My Tesla to get actual raw data from the BMS.

https://www.youtube.com/watch?v=x7NJIkOirVE https://sites.google.com/view/scanmytesla/home

5
FaeLLeOP•

What is a cheap ODB2 dongle and cable to use this with please?

1
Mori42•

https://sites.google.com/view/scanmytesla/adapters

1
Throwaway_Consoles•

Range depends on a LOT of factors but if you go by Troy Teslike’s table (which is highly regarded as accurate) your battery is at anywhere from 88% to 99% capacity based on trim/rims/tires/etc.

1
FaeLLeOP•

Can you guide me to a link to this resource please?

Edit: Found it on Google , all now thanks for pointing me to it.

2
jaqueh•

I believe Tesla has kept on rerating these batteries with “range” increases so you can’t necessarily compare with the original rated miles. 250 implied range seems bad though since the range may have been updated to 5% more by now. You should ask this question on here instead:

https://teslamotorsclub.com/tmc/forums/model-s-battery-charging.109/

This subreddit won’t provide anything useful to a Tesla owner other than “you shouldn’t have bought the car” or “haha what an idiot!”

-8
CornerGasBrentCOTW•

Why are you calling them an idiot and telling them they shouldn't have bought the car?

0
jaqueh•

Ok so prove me wrong by providing helpful advice to the OP then.

0