Is this normal battery degradation?

[Jonnymack74]

Hi
My 2019 75D should have a usable kwh of 72.5 (unless I'm mistaken)
Today on a road trip from 100% charge I reached 50% but had only consumed 29kwh which NY this math would give me a total of 58kwh of usable battery. Is this kind of degradation normal for a car of this age?

 

[Anth89]

Hello

72.5 KWh is a value for new cars and considers a safety buffer (4-5 KWh).
Furthermore the dashboard may forget some consumption, for example when you're stopped.
Therefore your values seem absolutely normal.

On my 100D (2017, 190 000 km) SMT reports now around 88-89 KWh usable capacity (supposed to be 97 KWh when brand new), but the same calculation than yours gives me usually 80-81 KWh.

 

[Jonnymack74]

Hello

72.5 KWh is a value for new cars and considers a safety buffer (4-5 KWh).
Furthermore the dashboard may forget some consumption, for example when you're stopped.
Therefore your values seem absolutely normal.

On my 100D (2017, 190 000 km) SMT reports now around 88-89 KWh usable capacity (supposed to be 97 KWh when brand new), but the same calculation than yours gives me usually 80-81 KWh.

You've done 190k km? That's a lot. Mine is almost 59k miles. It's almost 20% so feels like a lot of degredation

 

[Anth89]

It feels a lot but it is not correct.

You probably do not have more than 5% to 7%. The way you are measuring (through the consumption read on the dashboard) cannot allow you to measure degradation, for various reasons: consumption on the dashboard does not consider when the vehicle is idle, battery has a safety buffer, reference capacity is measure with ideal conditions (temperature etc.).

On my own case your calculation would lead to 17% (81/97). But the real calculation is 89/97 = 92% of initial capacity - 8% degradation.

There are many topics about that, most reliable ways to measure degradation is using tools like ScanMyTesla or Tessie.

 

[Jonnymack74]

I've just got tessie and it says my degradation is 8%. I'll see how this plays out over next couple weeks