🔋 Baseline for HV Battery SoH Performance (Battery Degradation Data by Taycan Owners)

[Bognar67]

Hi,

Update:
-40k km
-SoH 91,06%. Previous at 35k km 92,6%.
- Mostly AC 2,1/11kW, ca. 6-8% DC.

Sponsored

 

[freeforall]

@Chiu, from what app did you capture these screenshots please?

 

[Bognar67]

Bimmerflow (now eFlow) APP.
I use it with my BMW i4.
Trust a bit more Car Scanner that I use with the Taycan,

 

[Chiu]

@Chiu, from what app did you capture these screenshots please?

Yes, it's eFlow App, but Carscanner can get more data from EV.

 

[Daniel]

Thank you for this information, less data than Carscanner but the app is compatible with carplay

 

[Chiu]

Thank you for this information, less data than Carscanner but the app is compatible with carplay

That's true! haha.
But I hate the warning when OBD is connected to car (red alert with warning sound)

 

[Sace]

Update:

40400km
SoH: 89,66%
33% DCFC / 66% 11kW AC

 

[SergeyIndy]

I am hoping my SoH losses slow down. I wanted to show the historical chart in 1K mile intervals with my last point relevant for reporting to the thread with other points reported before.

 

[gtm]

I am hoping my SoH losses slow down. I wanted to show the historical chart in 1K mile intervals with my last point relevant for reporting to the thread with other points reported before.

@SergeyIndy , try a rebalance if you haven't. My guess is that you will improve to mid 92% range and (hopefully) settle there. I did a rebalance or two with minimal effect until I let the car sit at a low and high state of charge unplugged. Unplugged seemed to be the trick to let the BMS do it's magic. SoH improved from a low point of 90.93% to 92.33%, min/max cell voltage difference is now 3mv and I'm pretty convinced my range has actually increased (not just the GOM being optimistic). I'll know more about the range improvement after an upcoming road trip but it seems real based on local driving and consumption figures.

 

[Daniel]

That's true! haha.
But I hate the warning when OBD is connected to car (red alert with warning sound)

Same alert with Carscanner
After testing, the adaptation of eFlow app to CarPlay is quite basic and not very successful.

 

[SergeyIndy]

@SergeyIndy , try a rebalance if you haven't. My guess is that you will improve to mid 92% range and (hopefully) settle there. I did a rebalance or two with minimal effect until I let the car sit at a low and high state of charge unplugged. Unplugged seemed to be the trick to let the BMS do it's magic. SoH improved from a low point of 90.93% to 92.33%, min/max cell voltage difference is now 3mv and I'm pretty convinced my range has actually increased (not just the GOM being optimistic). I'll know more about the range improvement after an upcoming road trip but it seems real based on local driving and consumption figures.

Very good point. I have not done a rebalance. Would you please provide me with exact procedure that you followed to rebalance. I have it noted but would like to follow exactly what you did to get this kind of bump .

 

[gtm]

Very good point. I have not done a rebalance. Would you please provide me with exact procedure that you followed to rebalance. I have it noted but would like to follow exactly what you did to get this kind of bump .

Followed the advice @Vim Schrotnock got from the battery tech when he had some modules replaced . Here's the thread. https://www.taycanforum.com/forum/threads/once-again-the-battery.19571/page-4. Pretty simple. Discharge to below 10% +/- and let it sit overnight disconnected from shore power. Recharge slowly (level 2) to 100% SoC and let it sit overnight again, disconnected. Did this twice and it does seem to have real world benefits. Min/max cell voltages are much closer now both at higher and lower SoCs.

 

[ciaranob]

Fantastic amount of updates over last month and I’m still under major work pressure through end August and hardly been on here at all - so my sincere apologies for lack of database/chart updates but I’m still here, still tracking and will add all data asap!

 

[Tooney]

Porsche issued TSB for tips about Porsche official SoH testing procedure.
https://www.taycanforum.com/forum/t...-piwis-tester-july-19-2024.20795/#post-318572

 

[SergeyIndy]

Very good point. I have not done a rebalance. Would you please provide me with exact procedure that you followed to rebalance. I have it noted but would like to follow exactly what you did to get this kind of bump .

This is the outcome of the rebalance using the steps in the TSB for long term measurement and some interesting car behavior during the process.

Step 1: Discharge HV Battery and let it sit undisturbed for more than 6.5 hours
- 91.31% starting SoH
- Drove the car down to 4% SoC Display
- Recommended is 1-2%, but after the overnight hold, the SoC Display showed 2%
This means to me that the car used 2% of charge to do the rebalancing background work that seems a lot of energy, given that I never experienced any drop in SoC when parking the car for long periods of time with SoC in mid-range.

Step 2: Charge HV battery on Level 2 to 100% and let it sit undisturbed for more than 6.5 hours
- I stepped down my Level 2 charger to 40Amp since this would be a long charge window.
- Car fully charged and SoC Display showed 100% and 284 miles of Range estimate
- After the overnight holding period the SoC showed as 99% and 301 miles of Range estimate
This means to me that the car used 1% of charge to do the rebalancing in the background and then report higher Range as a result assuming more cells fell in line resulting in higher Range estimate.
- As soon as I started driving the estimate immediately dropped to 285 miles with 99% SoC
- 92.84 ending SoH gaining about 1.5% after the rebalance

Now, I would like to see the SoH level off and not drop at almost 1% per 1k miles moving forward.

Sponsored