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

[gtm]

@gtm - can I get your current mileage and should I assume your Soh still 90.93 - thx!

@Vim Schrotnock - thx fro sharing your Soh of 92.33 - can I get a current mileage to go with that - most appreciated, C.

@ciaranob I'm not sure of the point in time that you want the mileage reading. The last time I gave you battery statistics (9-28-23) was immediately after the road trip at 7736 miles. Mileage when I observed and posted (10-28-23) about the drop in SoH 4 weeks after the road trip was probably 7800 miles with very little local driving over those 4 weeks. Don't add this to your statistics because of the following.

I did a recent slow charge from 10% to 85% and the SoH increased. It had dropped to 90.93% but has now increased to 91.57%. I want to repeat the charging cycle again from a lower SoC and up to 100% before reporting in. Cell rebalancing?

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[ciaranob]

What is a good cadence for updates every 5000 miles? 10K?

What he said !

 

[ciaranob]

@ciaranob I'm not sure of the point in time that you want the mileage reading. The last time I gave you battery statistics (9-28-23) was immediately after the road trip at 7736 miles. Mileage when I observed and posted (10-28-23) about the drop in SoH 4 weeks after the road trip was probably 7800 miles with very little local driving over those 4 weeks. Don't add this to your statistics because of the following.

I did a recent slow charge from 10% to 85% and the SoH increased. It had dropped to 90.93% but has now increased to 91.57%. I want to repeat the charging cycle again from a lower SoC and up to 100% before reporting in. Cell rebalancing?

After the re-balancing is fine but TBH, all readings before and after such events can be insightful if only to highlight as to how the Soh can vary in real world use.

 

[Vim Schrotnock]

@gtm - can I get your current mileage and should I assume your Soh still 90.93 - thx!

@Vim Schrotnock - thx fro sharing your Soh of 92.33 - can I get a current mileage to go with that - most appreciated, C.

Absolutely. My SOH indicated on my UBS Vgate is still at 90.3%, but as I understand it, this is not completely accurate. My mileage, calculated on a 194 mile drive is 220 miles on 100% charge. This is some 50 miles less than I was getting before the problem. I'm also attaching the cell voltages at 2% and look forward to any comments you might have. These voltages are after multiple drives from 100% to 10-15% and letting the car sit for a day to 'balance'. The replaced modules are obvious.

 

[ciaranob]

Absolutely. My SOH indicated on my UBS Vgate is still at 90.3%, but as I understand it, this is not completely accurate. My mileage, calculated on a 194 mile drive is 220 miles on 100% charge. This is some 50 miles less than I was getting before the problem. I'm also attaching the cell voltages at 2% and look forward to any comments you might have. These voltages are after multiple drives from 100% to 10-15% and letting the car sit for a day to 'balance'. The replaced modules are obvious.

Sorry I should have been more specific - I meant your total miles on the car's odometer to date or at time of taking the Soh reading . Used to add to the plot.

In respect your cells, I must say that that is one of the 'busiest' outputs I have seen not withstanding the obvious replacements. Of course they vary entirely on SoC but the variance across the plot seems high on first glance. Would be curious to compare to different Soc states.

Also interesting when compared to @Scandinavian's experience to date in that his entire battery appears to have been 'reset' - Peter I wonder if you could share a cell map of your car as is today post-repair and if your replaced modules are as obvious as for Vim's?

 

[gtm]

After the re-balancing is fine but TBH, all readings before and after such events can be insightful if only to highlight as to how the Soh can vary in real world use.

I'll send off all the before and after readings once I've done another discharge/recharge cycle. I haven't put much mileage at all on lately so running it down below 10% is taking a while.

As far as Vim's voltage readings (new modules/cells aside) I have noticed that my voltage differences cell to cell are greater at a 15 or 20% SoC (typically 10 to 12 mv) but much more even at 85% (4 or 5 mv). Cell imbalances are possibly more pronounced way down at 2%?

 

[Scandinavian]

Sorry I should have been more specific - I meant your total miles on the car's odometer to date or at time of taking the Soh reading . Used to add to the plot.

In respect your cells, I must say that that is one of the 'busiest' outputs I have seen not withstanding the obvious replacements. Of course they vary entirely on SoC but the variance across the plot seems high on first glance. Would be curious to compare to different Soc states.

Also interesting when compared to @Scandinavian's experience to date in that his entire battery appears to have been 'reset' - Peter I wonder if you could share a cell map of your car as is today post-repair and if your replaced modules are as obvious as for Vim's?

I have not checked the cells at a low SoC. This is after charging the battery to 85% I think? I will try to get a picture at a lower SoC but perhaps nt as low as Vim. In my case the mcells closest to the 60 and 180 mark are the new cells.

I also wonder why we only can read 6 cells from each module as per Vim’s photo. I thought there were 12 cells in each module?

And on the SoH reset, it still indicates very high SoH and does not make any sense

 

[ciaranob]

I'll send off all the before and after readings once I've done another discharge/recharge cycle. I haven't put much mileage at all on lately so running it down below 10% is taking a while.

As far as Vim's voltage readings (new modules/cells aside) I have noticed that my voltage differences cell to cell are greater at a 15 or 20% SoC (typically 10 to 12 mv) but much more even at 85% (4 or 5 mv). Cell imbalances are possibly more pronounced way down at 2%?

Thx and indeed my thinking too re low SoC cell readings.

 

[ciaranob]

I have not checked the cells at a low SoC. This is after charging the battery to 85% I think? I will try to get a picture at a lower SoC but perhaps nt as low as Vim. In my case the mcells closest to the 60 and 180 mark are the new cells.

I also wonder why we only can read 6 cells from each module as per Vim’s photo. I thought there were 12 cells in each module?

And on the SoH reset, it still indicates very high SoH and does not make any sense

Thx Peter - as posted above suspect it is just a function of the lower SoC and less stable state. I will get some before and after data from my car once I go through my own battery rebalancing.

 

[Vim Schrotnock]

Sorry I should have been more specific - I meant your total miles on the car's odometer to date or at time of taking the Soh reading . Used to add to the plot.

In respect your cells, I must say that that is one of the 'busiest' outputs I have seen not withstanding the obvious replacements. Of course they vary entirely on SoC but the variance across the plot seems high on first glance. Would be curious to compare to different Soc states.

Also interesting when compared to @Scandinavian's experience to date in that his entire battery appears to have been 'reset' - Peter I wonder if you could share a cell map of your car as is today post-repair and if your replaced modules are as obvious as for Vim's?

Total mileage is 33,208 mi. I'm curious about the reason the new modules are about 20% higher in voltage than the others. My battery performance has dropped by just about this 20% - is this reflected in the low voltages of the older modules? Certainly you would not expect a 20% decline in battery performance after 3 years and 30K miles.

 

[ciaranob]

Total mileage is 33,208 mi. I'm curious about the reason the new modules are about 20% higher in voltage than the others. My battery performance has dropped by just about this 20% - is this reflected in the low voltages of the older modules? Certainly you would not expect a 20% decline in battery performance after 3 years and 30K miles.

Thx will get that posted but I suspect we are seeing some consistently confusing no.s fro batteries that have had modules repaired or replaced - in regards different cell voltages, I wonder if normal degradation of the original modules effects voltage capacity at different SOc's and poss. more so at lower SoC's?

Also just for ref but my car has an Soh of ca 88% after less than 2 years (suspect even lower but have not measured in a coupe months). I'm in an 'extreme' hot climate so not hugely off w.r.t to other similarly located cars - that said I am close to the lowest in the group - but again poss lowest mileage and least long range use - frustration nonetheless as I suspect I will still be 'just above' the 80% warranty break after three years!

 

[ciaranob]

@Vim Schrotnock
Your car added to the chart (Post #1).

 

[SergeyIndy]

1) Delivery SoH = 99.95% (Measured July 1, 2023)
2) Current SoH = 94.36% (Measured November 6, 2023) only 0.26% drop in the last 500 miles
3) Current mileage = 2,000
4) Home charging at 11kW once a week
5) Build date April 2023

*HV Battery sealant recall scheduled for November 14, 2023

I am not intending to create noise by posting every 500 miles, so please choose to exclude any of my data points. This data point is interesting since after the latest software update SOH has increased for the first time since I started measuring and I double checked the data to make sure no typos.

November 14, 2023:
* APB2 recall battery sealant test passed
* WPN9 update applied at the same time

1) Delivery SoH = 99.95% (Measured July 1, 2023)
2) Current SoH = 94.87% (Measured November 19, 2023) increased by 0.51 since last 500 miles
3) Current mileage = 2,527
4) Home charging at 11kW from typically 10%-15% to 85%
5) Build date April 2023

 

[ciaranob]

I am not intending to create noise by posting every 500 miles, so please choose to exclude any of my data points. This data point is interesting since after the latest software update SOH has increased for the first time since I started measuring and I double checked the data to make sure no typos.

November 14, 2023:
* APB2 recall battery sealant test passed
* WPN9 update applied at the same time

1) Delivery SoH = 99.95% (Measured July 1, 2023)
2) Current SoH = 94.87% (Measured November 19, 2023) increased by 0.51 since last 500 miles
3) Current mileage = 2,527
4) Home charging at 11kW from typically 10%-15% to 85%
5) Build date April 2023

Yep nothing new there as you may have read in numerous posts here - depending on a variety of factors expect swings of +/- 1 but we’ve seen (only) a couple as high as +/- 2.

 

[Gru]

did today a cell calibration (?) with some result
- 42840 km
- drove yesterday down to 6%
- went to charge this morning at the office (steady AC 22 kW) with SoC: 3.5% , SoH : 89.28% , batt. energy: 2.65 kWh. cell voltages showed some (minor) differences
- charged up to 85% (at 22kW - about 3hrs), paused it until late in the afternoon when i completed the charge to 100 %. New SoH : 91.57% (+2.29%). cell voltages very close to each other.
Batt. energy now at 79.15 KWh, ie +76.5 kWh, when charger shows 84.54 kWh : that's about 10% loss

re-did one today (from 8% to 85% - AC 22kW - 43080km). new SoH : 92.33.
That is +3% compared to a couple of weeks ago.
Weather conditions were the same (temp. / humidity)

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