If 91% is linear, I'm guessing original range would have been around 316.

According to Tesla's website on June 1, 2023 the range for the Model 3 Performance was advertised at 315 miles.

 

I don't believe for a second a two year old 12K mile tesla has 9% battery degradation. If you abused it maybe, but multiple studies on almost 2 decades of batteries have shown much less after many many times the mileage and time.

I say this with some personal facts. My 2017 Mercedes B250E (marketing pic below) with a Tesla powertrain went from 87 miles of range new to 82 in when I sold it last year (late 2016 build) with 40K miles. Calculates to about 6% degraded (8 years and 40K). 40K is ALOT of charging probably over 400 times.

I'd guess your BMS needs recalibrating. Plan a road trip and charge to 100% and let sit for some time, then take the trip.

This is another non-issue Tesla has blown up having this test on the car in my opinion. They're just asking people to complain about the results. Just drive the car.

 

I don't believe for a second a two year old 12K mile tesla has 9% battery degradation. If you abused it maybe, but multiple studies on almost 2 decades of batteries have shown much less after many many times the mileage and time.

I say this with some personal facts. My 2017 Mercedes B250E (marketing pic below) with a Tesla powertrain went from 87 miles of range new to 82 in when I sold it last year (late 2016 build) with 40K miles. Calculates to about 6% degraded (8 years and 40K). 40K is ALOT of charging probably over 400 times.

I'd guess your BMS needs recalibrating. Plan a road trip and charge to 100% and let sit for some time, then take the trip.

This is another non-issue Tesla has blown up having this test on the car in my opinion. They're just asking people to complain about the results. Just drive the car.

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Why do you say that? 10% degradation after two years is normal and within spec. My two year old MYP with just over 24k miles has about 13% degradation. My wife’s 2021 Y with over 38k miles has about 7% and my daughters 2019 M3P with over 59k miles has 17%.

Degradation generally flattens after the first year or two. IIRC the M3P lost about 8-9% the first year, and another 8-9% over the next 5.5 years after that.

Anecdotally, our perf variants likely took a bigger degradation as the batteries are likely stressed harder for “reasons”😂

 

This is another non-issue Tesla has blown up having this test on the car in my opinion. They're just asking people to complain about the results.

Who's complaining? (I mean other than you.)

I'd guess your BMS needs recalibrating. Plan a road trip and charge to 100% and let sit for some time, then take the trip.

Yeah. Plan and take a road trip for your peace of mind? I'll get right on that.

 

My 2024 M3P with 3,000 miles on her tested at 96% when I brought it home from Carvana in July 2025.

 

Haha! Yeah - probably not many 3s and Ys with as many as ~175K miles or more yet.

One thing I DON'T like about that graph is that it shows retention to be ~5% worse compared to a similar graph in the prior year's (2023) impact report.

In the newer graph, retention first touched 80% about 60,000 miles sooner.

Did another year's data reveal that batteries degrade more over time than previously thought?

Is there an error in one of the graphs? If so, is it the 2024 graph or the 2023 graph?

 

Did another year's data reveal that batteries degrade more over time than previously thought?

That's my guess. There aren't THAT many 200k+ Model 3/Ys out there I'd guess. Perhaps that's why they gave us the Battery Health Test so they could gather real world data from us guinea pigs!

 

I keep track of the battery degradation in my 2024 Tesla Model Y AWD LR that has a NCA Li-Ion battery and over 14 months of ownership and 18,684 km (11,610 miles) my degradation was 4% (78.8 as advertised by Tesla vs 75.6 in August 18th).
I don't need a battery degradation test (as my topic shows), the Energy Consumption screens are pretty much accurate for computing the real kWh battery capacity (ScanMyTesla shows 75.6 kWh while an average of the readings for the three cases give 75.5 kWh).

 

I have a 2023 model 3 rear wheel drive. Bought it new and it said max mileage was 275. 8000 miles late it says max is 266. Never saw 315 max ever!!

 

272 miles was what the RWD was advertised to have.
315 was the advertised range for the Performance.

 

Thanks, garsh. I am gone in the winter for 3 months. I leave the car plugged into my Tesla charger, to prolong battery life what should I set the charge limit to? Tesla says I should charge to 100% once a week, but I am not home to do that. Thanks in advance for your expert info!

 

If plugged in, set it to 50%.

The weekly 100% is for calibrating the BMS - not for battery health. When you get back, you can begin charging to 100% weekly again.

 

thanks, what’s BMS?

 

Thank you. What’s the best way to manage battery health?

 

To keep the battery in the optimal conditions so that the degradation of it, over time, is not becoming a nuisance and respects the warranty terms.
I think Tesla battery warranty is 8 years, 100k (or 160k) miles and less than 30% battery degradation. Don't you worry though, the Tesla batteries never dropped under 20% degradation even at 200k miles.

 

Thanks. How do I keep the battery in the optimal conditions so that the degradation of it, over time, is not becoming a nuisance.

 

Just follow what the manual indicates :

• for NMC/NCA battery : charge it to 80% in your daily driving and when charging at 100%, don't let it sit too much before driving it.
• for LFP battery (you don't have it in USA) : charge it to 80% in your daily driving and to 100% at least once per week to allow BMS to read the Max cell voltage value. Don't let it sit too much at 100% either.
• don't let the battery sit at low SOC (state of charge) either. Low = lower than 20% SOC.

For the rest, don't overthink and just drive it.