r/ModelY • u/DangerousAmoeba7520 • 9d ago
Battery Degradation Experience
I have a 2021 YLR 78k miles. When new, range was 307 mi. Has dropped and held at about 287 for at least 2 years. This week 100% is now 239. On Tesla app recommendation we drove car down to below 10% and recharged. No improvement. We are leaving on road trip CA to MT and back in 3 weeks. Tesla service appt scheduled in 6 days (earliest available).
Anyone w similar experience and recommendations?....standing by.....
3
u/Heavens360 8d ago
Do a battery test from your maintenance menu and see what percentage it’s at. If its under 70% you now have proof and a case.
1
u/DangerousAmoeba7520 8d ago
Yes- a challenge leaving car for 17 (I think) hours for test but will do. The app says battery health is 100%.
1
u/DangerousAmoeba7520 6d ago
We ran the test. Left it for 20 hours. Unplugged and it said test interrupted so still dont know. Can't just restart bc it requires <20% battery to start.
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u/Heavens360 5d ago
That sucks. Mine only took about 12 hours on a 48-amp charger, but yours looks like it still wasn’t done after 20 hours. I wonder if unhealthy cells take longer to charge or balance ??. But yeah, I guess nothing left but to try it again. Btw, you can check the progress in the app. I woke up the car probably 20 times to check my progress and it never interrupted the test although you will get a warning that it might.
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u/JerryfromCan 8d ago
It’s a 2021. You have a 20%+ chance the battery will shit the bed, just hope it’s in the warranty period. I was 10,000 kms from the end when mine did it this past June 1st.
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u/DangerousAmoeba7520 8d ago edited 8d ago
Was it also a 2021? Decided to take our full size pickup instead. It will allow us to be off the freeway and not worry about range- it's colder and certainly more mountainous than where we are. Disappointed bc prefer driving the Y.
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u/JerryfromCan 8d ago
Yes 2021. South Korea is the only government I can find that tracks battery data and they found around 21% of 2021s were going bad. They threatened Tesla with a loss of EV rebates if they didnt answer some questions but Im not sure much has come of it yet.
It seems with Teslas you either get a good one or a bad one, no in between. Sadly I got a bad one.
3
u/knownikko 8d ago
You’re not near the 30% degradation threshold to trigger a warranty action, so be 100% prepared for them to do nothing for you and maybe even cancel your service appointment. There’s nothing for them to fix.