Battery State Of Health, anyone ran it?

[jyavenard]

So I stopped over in front of my local Tesla service centre and could put the car in service mode.

Has anyone ever played with this?

“Vehicle needs to be plugged into a >= 6kW AC charger. The test will take up to 24 hours. Do not interact with the vehicle or the test may abort. See Toolbox Article 6384000 for more details about the SOH test.”

How do you know when it’s done?

 

[GtiMart]

Yeah, I've heard of people running it. Results don't look so good... In any case this will essentially do this:
- run the battery down by spending energy (heating and cooling battery at the same time essentially, since you're stationary).
- charge full
- report on how much energy went in.

You can do the same by driving, and some Youtubers do that. I believe it's : charge full, drive at 80-90kph with gentle acceleration etc, then charge full and count the amount of energy that goes in. You can adjust with the percentage you left in as you wouldn't quite drive until the car stops.

Your car estimates it in the "kilometers of range" displayed. TeslaFi gives an estimate (and other apps too). In any case you shouldn't worry about it unless your battery only gives 70% of advertised or so... I say it stresses the car for a non-important reason.

 

[zoomer0056]

There are a couple of mentions of this on TMC from people who ran this test. However, I could not find them.

 

[jyavenard]

I’ve lowered the battery to 48% (running the heater to its max on my 2019 M3; that draws between 6 and 7kW).
But it tells me that my SoC is too high.

 

[Mr X]

How about don't worry about it, drive your car and enjoy

 

[jyavenard]

Found that thread Battery health test

 

[KenC]

Obviously if you do it, you'd want to start with as low a SOC as possible in order to minimize the total time used.

 

[jyavenard]

Obviously if you do it, you'd want to start with as low a SOC as possible in order to minimize the total time used.

yeah, and luckily, with a 2019 car, you can drop the SoC by about 10%/hour

 

[jyavenard]

So I'm running it on mine.

I started with 20%. It went down to 8% and then stayed there for about 2 hours. After that it started charging.

The test was only using about 6kW to discharge the battery, having a 2019 model 3 with a resistive heater, I also started the heater to max temperature to speed things up a bit; it drew over 13kW at one stage. At 12% I stopped the heater and let the car proceed normally.

My battery was showing a nominal full pack of 68.3kWh at 50%; at 12% SoC it dropped to 67.9kWh.

 

[jyavenard]

Obviously if you do it, you'd want to start with as low a SOC as possible in order to minimize the total time used.

I'm not sure it helped that much TBH, it didn't go down to 0 as I read lots of people mention, it stopped at 8%.

 

[jyavenard]

Wel, that was a bit of a bummer. The test had completed. But for SOH it was still showing —-

So not sure what happened here.

 

[android04]

Wel, that was a bit of a bummer. The test had completed. But for SOH it was still showing —-

So not sure what happened here.

Something probably caused it to stop the test, since it didn't drain the battery to 0% like it should. Also, you don't need to go to a Service Center anymore to enter Service Mode. Service Mode "lite" is available anytime and anywhere now.

 

[jyavenard]

Service Mode "lite" is available anytime and anywhere now.

Not in Australia it isn’t.

 

[zoomer0056]

Not in Australia it isn’t.

I wonder if there's some regulations in Australia that don't allow this.