J1.1 Taycan High Voltage Battery Reliability Survey

[D00notD00d]

@D00notD00d tldr; there is software from a workshop in thailand. The owner did a lot of work on damaged batteries. He created a piece of sw (free to use) to diagnose your own battery pack. I did not see a single bad battery posted in the whole thread. Few had some weird readings but were packs where modules were replaced hence the weird reading. Confirming the 2% you, @Dee and I are thinking about.

Has there been some summary analysis of the numbers from that thread/the tool, or is the 2% a guess? What’s the sample size compared with the c. 150k j1.1 2019-2024 production figure? Who first mentioned the 2% figure. Confirmation bias?

Would bad batteries have been identified first via balancing failures, then via Porsche recall efforts from 2024 (their remote or workshop analysis); then later, the Porsche on-board error monitoring, before Cris’s sw is executed against the car? I don’t know how the functionality of each of those sw items differs and what overlap occurs. Does anyone outside Porsche?

Only Porsche has data. Only Porsche knows the facts. Everything else is anecdotal
Porsche are saying 2% of cars are affected. We don’t know the accuracy of that figure. We don’t know if it is a current estimate figure, or the number to be revealed across the entire J1.1 HVB service life. We know from Porsche that the defect can surface across the entire service life. This story has many more years to run. Like Dieselgate, the truth may never be willingly admitted.

I’m reminded of the Sherlock Holmes quote:
“Never theorise before you have data. Invariably, you end up twisting facts to suit theories instead of theories to suit facts.”
Only Porsche has the facts.

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[WattTurbo]

It only identifies if there is an issue in the present - masked by re-balancing procedure - which even CT14 says to not take as a grantee until you drive it some more and re-test it again.

The rebalancing procedure masks it, but from my own HV battery I think the biggest mask of all if the SOC. I didn't see the voltage delta being out of tolerance until I ran it down to 0% (on cluster not BMS). I've tested it at ~30%, ~50%, and 70% and they all showed within tolerance.

As to when the issue returns after rebalancing, on mine I ran it down to 0% again after 4 weeks and it was still within tolerance. It's very inconvenient to run it down to 0% so I definitely not going to do it again until the range gets crappy.

 

[electroboy]

just voted. car already 1.5 months in porsche center waiting for battery swaps to be done. i didn’t asked if they replaced only certain modules or entire pack with J1.2 but i’ll update once i have the answer when i collect back the car

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