this post was submitted on 24 Jun 2024
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Yes they are. I used to test them for a living. It's just a best guess.
No they aren't. They degrade before they fail. If tesla wanted to provide a warning of a failing battery that pretty much always worked it could have wired in a load test and went off voltage drop under a heavier load.
Testing if batteries are good or bad does not qualify a person to chart out battery degradation.
Yes. They are. If they weren't, no one would have these problems. But they all do. I know everyone likes to pour over them with a microscope and drool over their flaws because they're Tesla, but many of the issues commonly attributed to them are common with all other OEMs, you just have a bunch of armchair engineers who don't know WTF they're talking about.
No shit
Once again, I did this for a living, for a decade. We would constantly have cars with failed batteries, we would bring them in, charge them up, test them, they would pass, we'd send them on their way, and they would fail again, and come back for replacement. Our load tests also tested the alternator.
I worked on BMWs for years and they would regularly come in with the same problem, with no warning, even though they had a similar detection algorithm that mostly worked.
I also test batteries and this just looks like you all didn't test them well. Like you skipped the capacity test because it takes being hooked up for a long time instead of the test that takes 20 seconds to do.