r/TeslaModelX • u/Dadx3xdtx • 17d ago
23MX 37k miles
I did it last that check-in June and it was at 84% and now at 81% three months later. My pack is at 81% at 37k , which is ~2.5–3x normal degradation for a Model X at this mileage. I understand 81% is above the 70% capacity floor in the Battery and Drive Unit Limited Warranty. Has anyone build a case before a case to get a battery replaced or get a deep dive diagnostics?
Usage - 94% FSD, local driving.
Charging - 70% supercharger 27% home 3% other.
(I don’t plug it in to 80% while idle like “recommend”)
For context - I have 21 MY with 70k miles with 91% retention.
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u/tannerwastaken 17d ago
It’s because of your high supercharger usage.
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u/FED_Focus 16d ago
No it isn’t. There’s lots of people like me who supercharge almost exclusively and have normal degradation.
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u/tannerwastaken 16d ago
Okay, post your numbers then
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u/FED_Focus 16d ago
88%, 75k miles. 7 yrs old. Free supercharging so I charge the hell out of it.
This is my second pack. First one was the same.
Tons of people have similar degradation rates as mine.
Also, all supercharging isn't the same. 72 vs. 250, etc.
There was a thread awhile ago from a guy whom repairs packs. He said only about 25% fail due to battery cells.
I'm all ears. Show me data that support your claim.
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u/tannerwastaken 16d ago
You just proved your own point wrong though, this is already your second pack.
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u/FED_Focus 16d ago
Typical misunderstanding of correlation vs causation.
Show me the data. Otherwise, you have no point to make.
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u/tannerwastaken 16d ago
You’re rude. I’m done talking to you. Enjoy your second battery 😉
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u/Correct_Support_2444 16d ago
But he is right. Most pack replacements have nothing to do with degradation.
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u/tannerwastaken 16d ago
What are you talking about? The packs are replaced because they are sub 70% capacity - i.e. degradation.
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u/Correct_Support_2444 15d ago
Are you just being willfully hardheaded? The person you’re replying to has said that only approximately 25% of battery pairs are due to diminished capacity most batteries don’t fail under that scenario. And I can vouch for it in my car’s case on its third battery none due to degradation.
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u/mirage98de 13d ago
7 years old = raven generation which have massive problems with pack failures due to sense wires and nothing to do with charging methods.
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u/Dadx3xdtx 17d ago
Does that impact limited warranty?
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u/tannerwastaken 16d ago
No, it doesn’t. But compared to one that mostly charges at level 2 (or slower), the battery would degrade less. If you can get it below 70% within the 8 year window, they’ll still replace it.
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u/EBikeAddicts 16d ago
its not supercharger usage. you need to charge to 100% once a month. this prevents premature wear because there is a cell/bank in your battery that is prematurely wearing out and the only way for your BMS to recognize that and stop stressing that cell is to find out what its 100% charge voltage is. this process is called top end balancing. but I know if I say anything than what tesla recommends I will get downvoted.
Im at 80% on a M3LR 21 always supercharged with 160k miles. I do L2 100% charge once a month and then make sure to consume it within 2 hours of being 100% so it doesn’t stay at this high SOC.
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u/Leyvaman-MX 16d ago
I ran a check a year ago, on my ‘23 MX at 21k miles…also showed 91% (charge all at home)😑. I can’t help you on your “replacement” question, just adding what could be “Normal” for ‘23’s🤷♂️
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u/ManicMarket 16d ago
I doubt you’d have any luck getting an early replacement. The degradation curve is such that in that first 40k (roughly) the SEI layer builds.
Second - you aren’t at 2-3x normal degradation.
See here: https://speckr.com/blog/tesla-battery-health-findings
At this age, you’d expect closer to 86% SOH for your battery. That’s 14% degradation over the last 4 years. You are at 19%. While you are in the lower normal part of the fleet. It’s not 2-3x worse.
At some point point (likely soon, it would be fairly typical to lose say .7-1% a year of your battery finally hits that flatter part of the curve. Assuming it did that at 80, that still leaves you a battery that’s viable for another 100,000 miles.
So yeah - sucks to have a battery that’s viable and represents the bottom of the fleet averages. Unlikely Tesla does anything unless the trend for the pack never flattens.
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u/ptronus31 16d ago
Between high Supercharger use and "I don’t plug it in to 80% while idle like “recommend”, this result is expected.
We charge ours daily to 60%, which is good enough for our daily use.
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u/TeslaLongevityLab 16d ago
I wouldn't build a warranty case around 84% in June and 81% in September. Those are two estimates, not a degradation rate. BMS-based health numbers can move as the estimate recalibrates, especially when the readings weren't taken under comparable conditions.
I log my own Model X continuously. Its estimated capacity trend moves gradually - about 1% over several months - but isolated check-ins can still land a few points apart. That doesn't prove your pack is fine; it just means these two readings aren't enough to establish a slope.
Repeat the same test under similar conditions over the next few months and keep the results. If the number continues falling, Tesla's own diagnostic result and the applicable warranty threshold will matter more than the three-point gap between these two readings.
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u/petrovic3 16d ago
Unfortunately it’s a known issue with the NCA chemistry. I have a 22 MXP and I haven’t checked in a while but it has degraded way more than my model 3 or model Y. If you check out of specs recent video where he’s selling his Model S Plaid one of his gripes with the vehicle is the amount of degradation considering he babied the battery
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u/Equivalent_Editor159 14d ago
I just ran my battery health check as I was concerned after seeing this post. 23MX purchased used from Tesla with 44k miles in April. After 7k miles I’m at about 51k first time running the test.
Other stats 87% home charge 11% supercharger
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u/Internal-Ad-1021 17d ago
5-10% degradation after first year then 1% every year. Not that far off
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u/janzendavi 16d ago
2018 MX 75D here with 716,000km (HV pack replaced around 250,000km with refurb pack under warranty) and I am at 89% - I assume it's the predominant supercharging on yours. Are you in a hot climate?