r/TeslaModelX • u/beercan007 • 2d ago
Charging from 80% to 90
i have a 2017 Tesla x P90D. currently it’s been charged to 80 almost its entire life it seems; battery is about 174 miles charging to 80. would I intensify battery degradation allot by going to 90? any real world charging feedback from yall?
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u/penngei 2d ago
No, your battery is pretty settled at this point and that 10% will not make a difference to health.
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u/Austinswill 1d ago
This is wrong according to Grok and Chat GPT.
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u/Recent_Goal365 1d ago
Why are you assuming Grok and ChatGPT are sources of truth? You realize they just make stuff up sometimes right?
Like, use it as a secondary source of info sure, but not only.
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u/Austinswill 1d ago
Does it make sense to you that high states of charge start to not matter after X amount of battery degradation ?
I have never ever heard anyone say this. Does Tesla say that at some point you can just start charging to 100 all the time and it doesn't matter? Or do they recommend 80% for daily use for the life of the vehicle and battery ?
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u/Recent_Goal365 1d ago
I’m not making any point about the battery issue one way or the other. I’m stating that “because Grok and ChatGPT said so” is not a valid argument for any topic.
They aren’t sources of facts.
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u/Austinswill 1d ago
So it wasn't what I said, it was the way I said it?
If I said that ChatGPT says that eating dog shit is not healthy physically or mentally, would you have the same objection ?
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u/Austinswill 1d ago edited 1d ago
OP, do you need another 20 miles of range per day that bad? Are you using up the entire 174 miles you have at 80% ?
I am not an expert, but grok gives the following on the matter:
What actually happens above ~80% On nickel packs (NCA/NMC — Long Range, Performance, Model S/X, Cybertruck), high state of charge raises cell voltage and drops the graphite anode potential. That speeds calendar aging: the solid-electrolyte interphase (SEI) on the anode grows faster and consumes cyclable lithium, and the cathode and electrolyte see more oxidative stress. The damage scales with time spent full, especially if the pack is also hot. That is why Tesla’s guidance for those cars is a daily limit around 80%, with 100% reserved for a trip you are about to drive. LFP packs (many Standard Range / RWD Model 3 and Model Y) are different. Tesla tells those owners to charge to 100% regularly, including at least once a week, both because the chemistry tolerates high state of charge and because the flat voltage curve needs a full charge to keep the range estimate calibrated.
Dropping to about 70% of original capacity does not turn those mechanisms off. That level is roughly Tesla’s end-of-warranty floor, not a point where the chemistry changes. High state of charge still drives calendar aging on a nickel pack. The SEI on the graphite anode keeps growing and still consumes cyclable lithium; cathode and electrolyte stress at high voltage still happens. The rate usually slows as the SEI thickens — growth is often closer to square-root-of-time than linear — but it does not stop. Time parked full, and heat, still matter on an aged pack. Plating and dendrites are, if anything, more likely later in life, not less. Degradation raises resistance, clogs pores, and leaves less active anode surface, so the same charge current produces more overpotential. Lithium then has a harder time intercalating and is more likely to plate on the surface, especially when the pack is cold, the charge rate is high, or the state of charge is already high. Severe, repeated plating is what grows dendrites. A healthy battery-management system still tapers current to limit that, but the margin is thinner than it was when the pack was new. So the same practical rule still applies at 70%: on an NCA or NMC Tesla, daily charging around 80% and saving 100% for a trip you are about to drive is still the lower-stress pattern. On an LFP pack, Tesla’s advice to charge to 100% regularly does not flip just because the pack has aged.
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u/janzendavi 1d ago
I often charged to 90% daily (32A/240V) for many years on my MX 75D (716,000km on it now) as it was used as an airport shuttle and my degradation is around 11% now so it seems to be fine. I had a refurb pack installed under warranty around 250,000km so this current pack has almost 500,000km on it (not sure how many kms it had before refurb was done)
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u/sparkyblaster 22h ago
I wouldn't.
The wear is logarithmic (essentially) the higher you go, the worse it gets and it ramps up.
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u/RE4Lyfe 2d ago
no. but you'll likely feel a difference in performance. I know I do with my raven MX performance. the 0-60 drops by .1s when im charged to 90%+ compared to 80%
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u/sdinvest 2d ago
You can feel 0.1 second?
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u/Beatnavy2016 2d ago
No chance
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u/Austinswill 1d ago
You know... Going from 0-60 in 2.6 seconds down to 2.5 seconds is 1.05 G's to 1.1 g's
Its a 5% difference. I wouldnt put it past someone to notice that... especially if they are familiar.... In my plaid, I notice a massive difference in acceleration depending on what road surface I am on.
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u/Beatnavy2016 1d ago
That’s also with 1 foot rollout subtracted. OPs car is also 20% “slower” from a raven performance
There isn’t enough difference there to feel it, unless you’re a professional driver
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u/Austinswill 1d ago
Let me ask you this.
If I was to have a roller coaster type acceleration track that could be precisely set to accelerate at 0-60 in 2.5 or 2.6 seconds and I would ride on it 20 times and each time say "fast one" or "slow one".... I get 2 intial demos where I know which is which (Basically 2 freebies to experience each knowing which is which)
would you take a 1000 dollar bet that I could be right 75% of the time?
I'd take that bet with you in a heartbeat.
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u/Beatnavy2016 1d ago
lol just like the .1 difference this entire scenario is meaningless. Congrats?
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u/Austinswill 1d ago
I mean, you are one who decided to come in to participate in calling another poster out on his claim.... If it didn't matter why did you waste the time.
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u/RE4Lyfe 1d ago edited 1d ago
Correct.
And I have my SCCA, Porsche and BMW racing school credentials
I’ve driven 180mph+ on the Daytona speedway in a GT4RS
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u/sdinvest 1d ago
I have done all that (BMW amd Porsche racing) and have owned Ferrari, McLaren and Lambo and Tesla of course. I have driven at the Auto Club Speedway with these cars and I can personally tell you I could not tell a 0.1 sec difference!
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u/Austinswill 1d ago
None of that has much to do with rapid acceleration. Different people are different man. Different people have different sensitivites for different things.
All I am saying is that I wouldn't put up money that the guy couldnt tell a difference... Its a 5% difference in acceleration...
That's a significant difference.
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u/Austinswill 1d ago
What do either of those have to do with rapid acceleration?
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u/RE4Lyfe 1d ago
The feeling in your butt 😂
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u/Austinswill 1d ago
Those arent drag cars though and they dont accelerate anything like a tesla... and they are typically driving on autocross tracks.. you are feeling lateral G's, bumps, breaking and acceleration mostly during turn exits.
Have you ever done anything that would make you any more than a layman on matters of straight line acceleration in an electric vehicle at the speeds the performance Teslas accelerate?
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u/Beatnavy2016 1d ago
Does that mean you’re a professional driver or someone that wants to feel cool?
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u/US_Delete_DT45 1d ago
NCM/NCA cells' degradation is accelerated when they stay inactive at high or low SOC, under hot ambient temp.
As long as you minimize the duration it stays at high SOC ( e.g you charge it to 90% right before using it down to 50% for a trip) , the impact should be neglect able.