What is the evidence of “sufficient irreversible damage” “to cells or boards from heat exposure”?
Remember, Condition Z is simply a sensor error that generated false positives for Condition X.
Are you under the impression that Condition Z causes harmful heat exposure to something? If so what is the evidence for this belief?
Close. Tesla doesn’t yet have the income stream from servicing a large off-warranty fleet. That is really the true profit for both OEMs and their dealers, and it is a profit stream that Tesla will only get once the large fleet of Model 3s start to go off warranty.
I have zero proof or evidence. I have never torn down a pack or performed any diagnostics other than what tools such as TM-Spy provide (the last line of my post stated the entire post was my opinion.) I have read the
excellent technical explanation written by
@wk057 earlier this year. Nothing here is directly copied from that document.
IIRC, 2019.16.x brought the voltage caps to prevent possible overcharging from invalid voltage readings due to Condition Z, but the Supercharging nerfs didn't come until 2019.20.x. I believe it is possible that internal battery temperatures getting too high (on components not directly cooled from the battery coolant flow) during Supercharging may have contributed to Condition Z. This could potentially have been why newer 85 packs were charge-nerfed, despite having very little Supercharging use (my pack, specifically, had less than 800 kWh of Supercharging in its lifetime.)
Original "A pack" (early) 85s had a much lower SC rate from the beginning and never experienced the slowdown of Supercharging post 2019.20.x, nor were they affected by Condition Z. This may simply be a coincidence, but I think the Supercharging nerf was to reduce the internal heat in the later 85 packs to prevent damage (or further damage) to internal components (such as BMBs.)
Even if zero actual cell damage occurred due to high-rate Supercharging heat in this scenario, the logistics of removing a battery pack, shipping it back to Fremont, opening it up, testing/repairing/replacing sixteen BMBs per pack, shipping it back to the Service Center, and finally reinstalling it would constitute a significant cost per affected vehicle. So Tesla decides to nip this in the bud and reduce Supercharging speeds on all 85 packs that didn't have their rates limited from the start like the "A" packs.
Again, this is entirely my opinion and speculation only. I no longer have a dog in this fight.
