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

[Tooney]

A potential watchout regarding the discharge/hold at very low SoC%:
As described in several posts by owners, this recommendation from Porsche battery specialist also indicated that electrical system error warnings could be triggered by this process if the battery has problems.

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[D00notD00d]

I picked up my car yesterday after the ARA4 Module Replacement recall.
One module was replaced. The SofH is unchanged. 91% at 23500 miles since Oct 20. I’ve done 8,000 of those. Only about 10 fast charges during those.
I requested the dealer to provide a health report on completion of the work. They were happy to do this ‘while the bonnet was up’ and provided this report. It seems a template exists.

I‘ve posted here before that:
1) there’s a gap between what Porsche say and dealer capability.
2) 111 point checks on approved used cars do not include a formal SofH check.
3) servicing checks do not include confirming that the 3 year battery warranty milestone (80%) is met.
4) it is unclear what if any follow on warranty Porsche will make available after the 8 year battery specific warranty expires and if the Porsche Approved Warranty scope will cover battery failure or degradation.

To encourage customer loyalty and for residuals, Porsche should communicate its plan. I can cover any ICE Porsche up to 15 years old. Will Porsche retail EVs as classics? Should I keep my Taycan? Should I buy a new/newer one while mine still has some value?

All EV manufacturers face this challenge. The investment cost for HV work and skills and safety requirements make it unlikely that many independents will take on EV maintenance. Monopolies will occur.

i put the points and questions above to Porsche GB 6 weeks ago, then escalated them to the CEO support team. They’re hard questions to answer for any manufacturer, particularly expensive premium brands, but some clarity is needed if they want customers to continue to buy and own EVs.

 

[tchavei]

Update

30000km (shouldn't it warn about impeding service?)

SoH: 90.04% (why higher again? Been charging it with 150kW+ for the last 3 weeks as I did several trips around the country. Whatever ?)

Cheers

 

[Tooney]

Porsche:

Wienkoetter says early global data from the Taycan that’s been on sale since 2019 suggests battery degradation is much lower than engineers had originally forecast, something that correlates with comments and data released by other manufacturers, including Tesla.​

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“We’ve hardly seen a [Taycan] battery that has lost more than 5 per cent, 8 per cent (of its original capacity),” he said.​

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“We have one customer in France, he has driven 300,000 kilometres with his Taycan 4S … and his battery is well over 90 per cent (capacity), still.”​

https://www.taycanforum.com/forum/t...vailable-to-owners-article.20938/#post-320940

 

[D00notD00d]

Off subject, but related:

https://www.taycanforum.com/forum/threads/what-happens-after-8-year-battery-warranty.20954/

 

[SergeyIndy]

[EDITED:]
I would like to ask the OP @ciaranob if it would be beneficial to differentiate between original batteries from factory vs. rebuilds or replacements that are coded as EX (exchange). @Maelstrom is getting his battery replaced with the EX version. For example, let's add the data point for any new SoH reporting if the battery is OEM or Exchange/Rebuilt with install date.

I asked him to if he could capture the data as he gets his car back and then measure it overtime to see if EX batteries behave differently from OEMs. He mentioned that he had an option for replacement with OEM @ $72K but went with EX @ $45K before other charges, so if we had the data how these are different, this would inform anyone if replacement with the OEM is worth the difference.

 

[tchavei]

Another update

32000km

SoH: 89.92%

Cheers

 

[Dcshoes]

Probably one of worst:
2021 rwd base
Purchased SoH: na
Current @ 7000km
Current SoH: 86.2
100%soc = 320km

Anything I can do? Hitting 3 year mark within a few days and not enough to claim warranty.

 

[freeforall]

Probably one of worst:
2021 rwd base
Purchased SoH: na
Current @ 7000km
Current SoH: 86.2
100%soc = 320km

Anything I can do? Hitting 3 year mark within a few days and not enough to claim warranty.

With 7k kms in 3 years, it looks like you don’t drive it a lot. Your car is probably stored for long periods? The best way to limit degradation is to keep it between 30% and 50% (closer to 30% if it is very hot where you live and where you store your car)
Can you share how often you charge your car? To what SoC? Do you ever do long trips or is it only short ones? Where do you often park it? Is it hot where you park it?
If you don’t drive long distances (which seems like you don’t given your mileage), my recommendation to limit future degradation is to charge it to 50% only and make sure it stays above 30% after your trip. If you are going to drive longer trips, charge it up to 60% or 70% in a way that your SoC will be above 30% after your trip.
PS: it doesn’t mean that you can’t charge your car to 100%. It means charge it above 70% only when you need that. And don’t charge it to 100% multiple days before. Use the timer to get it to 100% for your departure time.

 

[Dcshoes]

With 7k kms in 3 years, it looks like you don’t drive it a lot. Your car is probably stored for long periods? The best way to limit degradation is to keep it between 30% and 50% (closer to 30% if it is very hot where you live and where you store your car)
Can you share how often you charge your car? To what SoC? Do you ever do long trips or is it only short ones? Where do you often park it? Is it hot where you park it?
If you don’t drive long distances (which seems like you don’t given your mileage), my recommendation to limit future degradation is to charge it to 50% only and make sure it stays above 30% after your trip. If you are going to drive longer trips, charge it up to 60% or 70% in a way that your SoC will be above 30% after your trip.
PS: it doesn’t mean that you can’t charge your car to 100%. It means charge it above 70% only when you need that. And don’t charge it to 100% multiple days before. Use the timer to get it to 100% for your departure time.

- drive it on the wkdays for like 10-20km per day for work
-barely any long trips with the taycan
-garaged so not hot nor cold
-usually charge from 30%-80% and last me about 2wks
-car shows 320ish km@100% but reality is about 250ish km

 

[D00notD00d]

- drive it on the wkdays for like 10-20km per day for work
-barely any long trips with the taycan
-garaged so not hot nor cold
-usually charge from 30%-80% and last me about 2wks
-car shows 320ish km@100% but reality is about 250ish km

From those ranges it sounds like you have the standard battery. If that’s the case they’re close to mine - at 24k miles and 91% SofH, certified.
Also seems like you have the MY2021 onwards better battery versions.

But at 7000km/4500 miles and with your good charging habits, the degradation quoted sounds atypical - albeit within the guarantee terms. The SofH is variable and may increase with with some forced balancing - there’s lots of advice about how to do that here.

I’d suggest asking for an end of warranty check of the battery. That isn’t part of any scheduled service. The formal Porsche position is that you have to pay a dealer for that, but that’s a dealer decision. That may at least give you peace of mind. Ask to speak to a HV tech for advice on whether your range is typical and what if anything you can do to limit further degradation. They’ll want to get to their own SofH figure.

If your journeys and charging habits remain the same, and if degradation is linear, the extrapolation from 14% degradation in 7000km forward to the 160000km 8 year/70% warranty limit doesn’t look good!

At 2% degradation every 1000km your battery would require replacement under guarantee before the 8 year warranty milestone.Ask the Porsche dealer to focus on that.

 

[freeforall]

-usually charge from 30%-80% and last me about 2wks

You might want to change that. Just charge at 50% only and plug it everyday instead of charging it at 80% once every 2 weeks. You almost don’t drive your car so technically, it is almost stored all the time. Also small depth of charges preserve much more the battery.
My daily trips are very small but I try to stick to the best practices I explained above and I am currently at 22k kms / almost 2 years and my SoH is 99%.

-car shows 320ish km@100% but reality is about 250ish km

I don’t think that means a lot. If you drive mainly in the city the RWD is not very efficient. I do also lot of small trips (around 5 or 10 km) and my real range in city is similar to yours (I drive the car without thinking about range so sometimes a bit sporty)
But for long trips (100+ km) mainly in highway with high speed 130-140km/h I am able to get 400+ km of real range (and if I am more careful about range I can even get more)
And I have have 21” tires. So RWD is very efficient for long highway trips which is the most important from a range perspective. Having 250km range for your small 10km city trips is not a big problem IMHO.

 

[Gru]

But for long trips (100+ km) mainly in highway with high speed 130-140km/h I am able to get 400+ km of real range (and if I am more careful about range I can even get more)
And I have have 21” tires. So RWD is very efficient for long highway trips which is the most important from a range perspective. Having 250km range for your small 10km city trips is not a big problem IMHO.

I have the same configuration but there is no way I can reach 400km at those speeds. Consumption is around 22/23 kWh/100km in summer, so more like 300km if I go from 100% to 10/15%

 

[freeforall]

I have the same configuration but there is no way I can reach 400km at those speeds. Consumption is around 22/23 kWh/100km in summer, so more like 300km if I go from 100% to 10/15%

I didn’t say that you arrive at your 1st charging station after 400km. I said the range was 400km
For my last trip from Paris to Aix this summer I arrived to the 1st charging station after 358.6 km with 9% left.
And this was in normal travel conditions with A/C on, music on, 2 adults and 2 kids in the car and 3 big luggage.

 

[D00notD00d]

@freeforall
Your comment
“You might want to change that. Just charge at 50% only and plug it everyday instead of charging it at 80% once every 2 weeks. You almost don’t drive your car so technically, it is almost stored all the time. Also small depth of charges preserve much more the battery” …
is opposite to the advice I received from a Porsche HV tech, which was in effect charge only when needed rather than plug in every day. Reducing the number of charging cycles seemed to be good advice. But your SofH is unarguable!
As is your point that the range is currently sufficient for the OP’s need.

But at 86% health at 7000km, if degradation continues at 2% every 1000km, in another 8000km the battery would not meet the 70% life at 8 years warranty term.
The OP should get Porsche to certify the SofH and then get Porsche to give written advice regarding best charging practice relevant to their particular typical usage.

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