Used EV Battery Health Estimator by Model
Estimate the State of Health (SoH) and remaining range of a used EV using model-specific median results from the Aviloo Certified EV Battery Report — an independent dataset built from more than 500,000 real battery tests conducted between 2022 and 2026.
Estimate Battery Health
Your Estimated Battery Health
Source: Aviloo Certified EV Battery Report, median results across 500,000+ independent tests (2022–2026). Figures are statistical estimates based on study medians — they are not a measurement of any specific vehicle.
How to Use This Estimator
- Pick your model. Select the exact model from the dropdown. The list mirrors the 20 vehicles included in the Aviloo study, so every model returns a real study-based figure rather than an industry average.
- Check the rated range. The tool auto-fills a typical rated range for the model. Adjust it if your vehicle's window sticker or current spec sheet lists a different number — projected range is calculated directly from it.
- Enter the odometer reading. Type the mileage or drag the slider. The result recalculates instantly, with no submit button required.
- Read the result. The large figure is the estimated State of Health. Below it you will see projected remaining range, miles lost versus new, and how much buffer the estimate has above the common 70% warranty floor.
How the Estimate Is Calculated
The Aviloo report publishes a median State of Health for each model at two mileage milestones within the study: roughly 31,000 miles (50,000 km) and roughly 93,000 miles (150,000 km). This tool connects those two published data points with a straight line and reads off the value for your mileage.
Formula used (within study range):
SoH = SoH31k + [ (M − 31,069) ÷ (93,206 − 31,069) ] × ( SoH93k − SoH31k )
Where M is the mileage you entered, SoH31k is the study median at 31,069 miles and SoH93k is the study median at 93,206 miles.
Projected range: Rated range × (Estimated SoH ÷ 100).
Below 31,069 miles: the tool returns the study's 31,000-mile median, because the study does not publish a reliable lower-mileage figure. Newer vehicles therefore receive a conservative estimate.
Above 93,206 miles: the study data ends here, so the tool projects forward using the same slope observed between the two study points. Any projected result is clearly flagged as extrapolated, and the projection is floored at 60% SoH to avoid absurd values at extreme mileages.
Limitations you should know about: linear interpolation between two published medians is an approximation. The study's underlying distribution is not perfectly linear, and a genuine measurement of any individual vehicle requires an OBD-based battery test. The median can also hide wide variation — Aviloo reports that same-model, same-mileage vehicles can differ by as much as 13.5 percentage points at 150,000 km.
Understanding the Study Results by Model
The table below shows the median State of Health published in the Aviloo report at 31,069 miles and 93,206 miles. The final column is the tool's performance tier for each model, based on its 93,206-mile result relative to the fleet.
| Model | SoH @ 31k mi | SoH @ 93k mi | Standing |
|---|
Top performers: seven models retain at least 92.5% of original capacity at 93,206 miles. The Mercedes-Benz EQA (94.0%) and Hyundai IONIQ 5 (93.8%) lead the field.
Below-average performers: four models fall below 90% at the same mileage — the Tesla Model 3 (88.9%), Renault Zoe (87.3%), MINI Cooper SE (87.1%) and Nissan Leaf ZE1 (86.7%). That does not automatically make them bad buys, but it does mean a used example deserves a closer look.
Practical Tips for Used EV Buyers
- Treat the estimate as a screening figure, not a verdict. If the projected SoH sits close to the warranty floor, commission an OBD-based battery health test before signing.
- Ask how the car was charged. Frequent DC fast charging, deep discharges and long periods parked at very high or very low state of charge all accelerate capacity loss.
- Consider climate history. Vehicles kept in consistently hot climates tend to degrade faster than those in temperate regions, even within the same model.
- Remember the 70% warranty floor. Most U.S. EV battery warranties cover capacity loss down to 70% within 8 years or 100,000 miles. Ask the seller whether that coverage is still active and transferable.
- Read the result as a range of outcomes. The study median is the middle of a wide distribution. Your specific car could sit well above or below it.
Common Mistakes to Avoid
- Using the odometer slider value as your rated range. The slider sets mileage, not range. The rated range field is separate and auto-filled.
- Assuming the estimate applies to a specific car. It describes the median of a large sample, not the vehicle sitting in front of you.
- Comparing an extended-range trim against a standard trim. Range varies significantly between trims of the same model. Edit the rated range field to match your actual vehicle.
- Ignoring extrapolated results. Beyond 93,206 miles, the tool is projecting from a study slope rather than reading published data. The result is flagged on screen for a reason.
- Treating a strong model median as a guarantee. A Model Y that spent four summers in Arizona can sit well below a Leaf that spent its life in the Pacific Northwest.
Frequently Asked Questions
What is State of Health (SoH) on an EV battery?
State of Health is the remaining usable capacity of a battery pack expressed as a percentage of its original capacity when new. A pack at 90% SoH can store roughly 90% of the energy it once held, which typically translates into a similar reduction in driving range.
How much EV battery degradation is normal?
The Aviloo study found that 16 of the 20 models tested retained at least 90% of their original capacity after 150,000 km (about 93,206 miles). Median results ranged from 94.0% for the Mercedes-Benz EQA down to 86.7% for the Nissan Leaf ZE1. Anything within a few percentage points of the model median should be considered typical.
How much range does a Tesla Model 3 lose after 100,000 miles?
The Aviloo study records a median of 88.9% SoH for the Tesla Model 3 at 93,206 miles. Interpolating to 100,000 miles produces an estimate close to that figure. Applied to a 358-mile rated range, that suggests roughly 318 miles of projected range — about 40 miles below the original rating.
Which EV has the best battery longevity?
In the Aviloo dataset, the Mercedes-Benz EQA (94.0%), Hyundai IONIQ 5 (93.8%) and BMW i4 (93.6%) show the highest retained State of Health at 93,206 miles. Note that several of these models are not officially sold in the U.S. Among U.S.-market vehicles, the Hyundai IONIQ 5, Ford Mustang Mach-E and Tesla Model Y all perform well.
Is the 70% warranty threshold important?
Yes. Most U.S. EV battery warranties cover capacity loss if State of Health falls below 70% within 8 years or 100,000 miles. If a used EV's estimated SoH sits close to that line, the remaining warranty coverage becomes an important part of the purchase decision.
What happens if my EV battery drops below 70% SoH?
If the vehicle is still inside its battery warranty window, the manufacturer is typically obligated to repair or replace the pack. Once outside warranty, replacement cost falls to the owner. Replacement packs commonly run into the thousands of dollars, which is why SoH matters so much on a used purchase.
Why can two identical EVs have different battery health?
Charging habits, average ambient temperature, depth of discharge, how often the car sat at very high or very low state of charge, and how often DC fast charging was used all influence degradation. Aviloo reports that same-model vehicles at the same mileage can differ by as much as 13.5 percentage points.
Can I check my own EV's battery health without this tool?
Yes. An OBD-II adapter combined with a battery diagnostic app can read the pack's reported State of Health directly. Dedicated services such as an Aviloo test also produce a certified report. This estimator is a screening tool based on study medians and is not a substitute for either method.
Is this estimator accurate for a specific used car I'm looking at?
No. It tells you what is typical for that model at that mileage. Your specific car could sit several percentage points above or below the median. Always commission a real battery test before purchase if the number is close to the warranty floor or the asking price is high.
Why does the tool use mileage instead of age?
The Aviloo study reports results by mileage milestone, not by vehicle age, so mileage is the only dimension the published data supports. Age does influence degradation through calendar aging, but the study does not publish a time-based curve that could be used without inventing data.
What does "extrapolated" mean in the result?
It means the mileage you entered is above 93,206 miles, which is the highest point covered by the study. The tool continues the observed degradation trend forward. The result is a reasonable projection, not a published data point, and the on-screen note says so.
Does the estimate account for charging habits or climate?
No. The tool reflects the study medians, which already blend a wide range of owner behaviors and climates. If you know a specific vehicle was fast-charged frequently or lived in a hot climate, treat the estimate as the optimistic end of the range and get a real test before buying.
Where does the data in this tool come from?
Model-by-model median State of Health figures come from the Aviloo Certified EV Battery Report, an independent study covering more than 500,000 battery tests conducted between 2022 and 2026. Rated range figures are typical manufacturer-published ratings for each model and are editable so you can match your specific vehicle.
Related Tools and Guides
Disclaimer and Methodology Notes
This tool produces statistical estimates derived from published median State of Health values for each model. It does not measure, diagnose or certify the condition of any individual vehicle.
Linear interpolation is used to connect the study's 31,069-mile and 93,206-mile data points. Mileage below the lower point returns the lower-point median. Mileage above the upper point is projected forward along the observed slope and is flagged on screen.
Individual vehicle battery health can vary substantially from the model median — Aviloo reports same-model spreads of up to 13.5 percentage points. Before purchasing a used EV, obtain an independent battery health assessment through an OBD-based test or a certified diagnostic service.
Battery warranty terms vary by manufacturer, model year and country. Confirm coverage directly with the manufacturer or dealer before relying on any warranty assumption. This page does not provide financial, legal or mechanical advice.
Used EV Battery Health by Model: Aviloo Study Results and How to Estimate Yours
If you're shopping for a used electric car, the single biggest unknown is the battery. A clean Carfax and a fresh set of tires tell you almost nothing about whether the pack under the floor still holds 95% of its original capacity or is creeping toward the 70% warranty floor. Two cars that look identical on a dealer lot can differ by ten percentage points of State of Health — and that gap can mean the difference between a great used purchase and a $10,000 mistake.
The Aviloo Certified EV Battery Report — an independent study of more than 500,000 real-world battery tests collected between 2022 and 2026 — is the most useful public dataset available for comparing models on this front. This guide walks through what the study found, what the numbers mean for a specific used car you're considering, and how to translate battery health into actual driving range.
Use our Used EV Battery Health Estimator to get a model-specific estimate for any mileage between 0 and 200,000 miles. It's built directly on the Aviloo medians, and it's free.
Key Takeaways
- 16 of the 20 models in the Aviloo study retained at least 90% State of Health at 93,206 miles (150,000 km).
- The best performers were the Mercedes-Benz EQA (94.0%), Hyundai IONIQ 5 (93.8%) and BMW i4 (93.6%).
- The weakest were the Nissan Leaf ZE1 (86.7%), MINI Cooper SE (87.1%) and Renault Zoe (87.3%).
- Two identical cars at the same mileage can differ by up to 13.5 percentage points in SoH. The median is a starting point, not a verdict.
- Most U.S. EV battery warranties cover capacity loss down to 70% within 8 years or 100,000 miles.
- A real battery health test — not a median estimate — is the only way to know the condition of a specific car.
What Is EV Battery State of Health (SoH)?
State of Health (SoH) is the remaining usable capacity of a battery pack expressed as a percentage of its original capacity when new. A pack at 90% SoH can store roughly 90% of the energy it once held, which typically translates into a similar reduction in driving range.
SoH vs. Capacity vs. Range
These three terms get used interchangeably in EV discussions, but they measure different things:
| Term | What It Measures | Typical Units |
|---|---|---|
| State of Health (SoH) | Remaining capacity as a percentage of original | % |
| Usable capacity | Actual stored energy the pack can deliver today | kWh |
| Estimated range | Distance the car can travel on a full charge | miles |
SoH is the underlying driver. When it falls, usable capacity falls with it, and range follows. The relationship is not perfectly linear in the real world because the car's software manages the pack conservatively at both the top and bottom of the state-of-charge window, but for consumer purposes, SoH × original range is a solid approximation.
Aviloo Study: 500,000 Tests, 20 Models, Two Mileage Milestones
Aviloo is an Austrian battery diagnostics company that has been publishing fleet-wide battery health data since 2022. Their September 2026 report is the largest consumer-facing EV battery study ever released: over 500,000 individual battery tests from real vehicles across North America, Europe, Australia, and Asia.
How the Study Was Conducted
- Tests were performed on real customer vehicles, not lab cells.
- Each vehicle's State of Health was measured using Aviloo's certified diagnostic process.
- The study reports median SoH at 50,000 km (31,069 miles) and 150,000 km (93,206 miles).
- Only models with sufficient sample sizes are included — 20 in total.
- The report is updated twice a year, and Aviloo is expanding its U.S. presence after a $30 million investment round.
Three Key Findings
- Most modern EV batteries hold up well. 16 of 20 models still delivered at least 90% SoH after 93,206 miles.
- The gap between best and worst is meaningful. The spread between the Mercedes-Benz EQA (94.0%) and Nissan Leaf ZE1 (86.7%) is over seven percentage points — roughly 25 miles of range on a typical mid-size EV.
- Individual cars vary widely. Same-model, same-mileage vehicles can differ by up to 13.5 percentage points in SoH. Averages hide this — and buyers need to know it.
Try the Used EV Battery Health Estimator
Reading model-level medians is useful, but the number that actually matters to a used car shopper is "what does my specific model at this specific mileage look like?" That's what our estimator answers.
Open the Used EV Battery Health Estimator →
The tool lets you:
- Select any of the 20 models covered by the Aviloo study.
- Enter a mileage from 0 to 200,000.
- See an estimated State of Health, projected remaining range, and how far above or below the 70% warranty floor the model typically sits.
It's not a diagnostic. It's a screening tool — the fastest way to know whether a car's expected battery condition is normal, above average, or worth a closer look.
Full Model Ranking: Best and Worst EV Batteries After 93,000 Miles
The table below lists every model in the Aviloo report, with the median State of Health at 31,069 miles and 93,206 miles. Models are sorted by their 93,206-mile result, best to worst.
| Model | SoH at 31k mi | SoH at 93k mi | Standing |
|---|---|---|---|
| Mercedes-Benz EQA | 96.6% | 94.0% | Top performer |
| Hyundai IONIQ 5 | 97.1% | 93.8% | Top performer |
| BMW i4 | 95.6% | 93.6% | Top performer |
| Hyundai Kona Electric | 96.3% | 93.0% | Top performer |
| Volvo XC40 Recharge | 95.2% | 92.8% | Top performer |
| Ford Mustang Mach-E | 95.1% | 92.5% | Top performer |
| Polestar 2 | 95.0% | 92.5% | Top performer |
| Cupra Born | 94.8% | 91.9% | Average |
| Volkswagen ID.3 | 94.6% | 91.8% | Average |
| Audi Q8 e-tron | 95.7% | 91.3% | Average |
| Skoda Enyaq iV | 95.1% | 91.0% | Average |
| Volkswagen ID.4 | 95.2% | 90.8% | Average |
| Peugeot e-208 | 94.2% | 90.7% | Average |
| Vauxhall / Opel Corsa-e | 94.1% | 90.7% | Average |
| Audi Q4 e-tron | 95.0% | 90.6% | Average |
| Tesla Model Y | 94.4% | 90.3% | Average |
| Tesla Model 3 | 93.8% | 88.9% | Below average |
| Renault Zoe | 91.6% | 87.3% | Below average |
| MINI Cooper SE | 94.1% | 87.1% | Below average |
| Nissan Leaf ZE1 | 91.2% | 86.7% | Below average |
Source: Aviloo Certified EV Battery Report, September 2026. Medians across more than 500,000 independent tests conducted between 2022 and 2026.
Top 5 Performers
Seven models sit at 92.5% SoH or better. The standouts:
- Mercedes-Benz EQA (94.0%) — not sold in the U.S., but a useful benchmark for the platform.
- Hyundai IONIQ 5 (93.8%) — widely available in the U.S. and one of the strongest real-world performers in the study.
- BMW i4 (93.6%) — a strong result for a high-performance sedan.
- Hyundai Kona Electric (93.0%) — a solid used-EV option at lower price points.
- Volvo XC40 Recharge (92.8%) — strong thermal management pays off.
Bottom 5 Performers
Four models sit below 90% at 93,206 miles. That does not automatically make them bad buys — the depreciation on these often makes them excellent value — but a used example deserves a closer look.
- Nissan Leaf ZE1 (86.7%) — the oldest mainstream EV in the study, and the one that predates most modern thermal management.
- MINI Cooper SE (87.1%) — small pack, high cycle count per mile.
- Renault Zoe (87.3%) — not sold in the U.S.
- Tesla Model 3 (88.9%) — the only top-selling U.S. model in the bottom quartile.
Tesla Model 3 and Model Y Analysis
The Tesla results deserve their own discussion. Both the Model 3 and Model Y land below the study median at 93,206 miles, which surprises a lot of buyers given Tesla's reputation for battery engineering.
| Model | SoH at 93k mi | Study Rank |
|---|---|---|
| Tesla Model Y | 90.3% | 16th of 20 |
| Tesla Model 3 | 88.9% | 17th of 20 |
There are a few plausible reasons. Tesla vehicles tend to be driven more miles per year than average, and many are fast-charged more often. Neither car is failing — 88.9% at 93,000 miles is still healthy — but a used Model 3 buyer should expect more degradation than a used IONIQ 5 buyer at the same mileage.
Why Same-Model EVs Can Differ by 13.5% in Battery Health
The most important number in the Aviloo study is not in the table. It's the spread: up to 13.5 percentage points between the best and worst examples of the same model at the same mileage. For the Hyundai IONIQ 5, the spread exceeds 12 points.
That variation comes from four main factors:
Charging Habits
Frequent DC fast charging, charging to 100% every night, and running the pack to very low states of charge all accelerate capacity loss. A car that was topped up overnight on a Level 2 charger and rarely driven below 20% will outlast an identical car that was road-tripped on 350 kW chargers every weekend.
Climate and Temperature
Heat is the single biggest external stressor on a lithium-ion pack. A car that spent four summers in Phoenix will typically show more capacity loss than the same car in Seattle. Cold weather does not degrade the battery permanently, but it does stress it, and repeated rapid-temperature swings add up over time.
Battery Size and Cycling
Smaller packs cycle more often for the same mileage. That's why the MINI Cooper SE — a small-battery city car — shows more degradation than a large-battery crossover driven the same distance. Total energy throughput, not odometer, is what ultimately wears a pack down.
Battery Management System Quality
Modern packs rely on the BMS to keep cells balanced and to manage thermal load. Manufacturers that invest in liquid cooling and conservative charge curves (Hyundai, BMW, Volvo) tend to see better long-term retention than those that prioritize peak charge speed.
How to Calculate Range Loss from Battery Degradation
SoH becomes useful only when you translate it into driving range. The formula is simple:
Projected range = Rated range × (SoH ÷ 100)
Real-World Example: 2022 Hyundai IONIQ 5 at 75,000 Miles
Let's walk through a specific case that a used-EV buyer might encounter.
| Input | Value |
|---|---|
| Model | Hyundai IONIQ 5 |
| Rated range (window sticker) | 303 miles |
| Odometer | 75,000 miles |
| Estimated SoH (from Aviloo interpolation) | ~94.5% |
| Projected remaining range | ~286 miles |
| Range lost vs. new | ~17 miles |
At 75,000 miles, the IONIQ 5 is still projected to hold roughly 286 miles of range. That's less than a 6% loss — and it comfortably clears the 70% warranty floor for years to come.
Compare that to a 2018 Nissan Leaf with a 40 kWh pack and 151-mile original range at the same mileage. If its SoH sits around 87%, projected range drops to roughly 131 miles — still usable for a commuter, but a meaningful reduction that a buyer should factor into pricing.
EV Battery Warranty: The 70% Threshold Explained
8-Year / 100,000-Mile Standard
In the United States, federal law requires EV battery warranties of at least 8 years or 100,000 miles. Most manufacturers go further, warranting the pack against capacity dropping below 70% within that window. A few, like Hyundai and Kia, extend the coverage to 10 years or 100,000 miles.
What this means practically:
- If a covered pack falls below 70% SoH during the warranty period, the manufacturer is typically obligated to repair or replace it.
- Warranty terms vary by manufacturer and model year. Always check the specific car's warranty booklet rather than assuming.
- Warranty transferability varies. Most major brands allow the battery warranty to transfer to a second owner, but not all.
What Happens If Your Battery Drops Below 70%
Inside warranty, the manufacturer repairs or replaces the pack at no cost. Outside warranty, the cost falls on the owner. Replacement packs commonly run into the thousands of dollars, and on some older EVs the cost of a new pack approaches the value of the car itself.
This is why SoH matters so much on a used purchase. A car sitting at 75% is fine. A car sitting at 71% with 18 months left on its warranty is a different conversation entirely.
Limitations of Median Data
Why Individual Inspection Is Still Recommended
The Aviloo medians tell you what is typical. They do not tell you what is true about the car in front of you. Given the 13.5-point spread documented in the study, a specific vehicle could sit well above or well below the median for its model and mileage.
Before buying any used EV, especially one whose asking price depends on its battery condition, get a real test. The two most common options:
- OBD-based battery test: A Bluetooth OBD-II adapter plus a diagnostic app can read the pack's reported State of Health directly. Inexpensive, but accuracy varies by vehicle and app.
- Certified battery report: A service such as Aviloo's Flash Test produces a documented, manufacturer-independent SoH reading. This is the strongest evidence you can put in front of a seller during negotiation.
About the Aviloo Certified EV Battery Report
Aviloo is an independent battery diagnostics company headquartered in Austria. Their report is based on tests from real customer vehicles and is published semi-annually. It is not sponsored by any automaker, which makes it one of the more neutral sources of battery health data available to consumers. The company recently announced a $30 million investment to expand into the U.S. market, including partnerships with dealership platforms.
Frequently Asked Questions
How much EV battery degradation is normal?
The Aviloo study found that 16 of the 20 models tested retained at least 90% of their original capacity after 93,206 miles. Median results ranged from 94.0% (Mercedes-Benz EQA) down to 86.7% (Nissan Leaf ZE1). Anything within a few percentage points of the model median should be considered typical.
Which EV has the best battery longevity?
In the Aviloo dataset, the Mercedes-Benz EQA (94.0%), Hyundai IONIQ 5 (93.8%) and BMW i4 (93.6%) retain the highest SoH at 93,206 miles. Several of these are not officially sold in the U.S., so for American buyers the IONIQ 5 is the most relevant top performer.
How much range does a Tesla Model 3 lose after 100,000 miles?
The Aviloo study records a median of 88.9% SoH for the Tesla Model 3 at 93,206 miles. Applied to a 358-mile rated range, that suggests roughly 318 miles of projected range — about 40 miles below the original rating.
Is a used EV with 90% battery health worth buying?
Yes, in most cases. 90% SoH is well above the 70% warranty floor and represents a healthy pack. The asking price should reflect the remaining range and any remaining warranty coverage, but there's no reason to avoid a car solely because it sits at 90%.
What happens if my EV battery drops below 70%?
Inside the warranty period, the manufacturer is typically obligated to repair or replace the pack. Once outside warranty, replacement cost falls to the owner. This is why the 70% threshold matters so much on a used purchase decision.
How long does an EV battery last before replacement?
Most modern EV batteries are designed to retain useful capacity well beyond 150,000 miles, and Aviloo's data supports this. The average pack outlives the average ownership period. Replacement is uncommon outside of defect scenarios, extreme climates, or unusually high-mileage fleet use.
Can I check EV battery health without an OBD scanner?
You can't get a precise reading without a diagnostic tool, but you can get a rough sense by comparing the car's current displayed range at 100% charge against its original rated range. If it's lost more than 20%, the pack deserves a closer look. This method is approximate and can be affected by software updates that change the displayed range.
What is the difference between SoH and capacity?
State of Health is a percentage; capacity is a fixed energy measurement in kilowatt-hours. A pack with 60 kWh usable capacity when new and 54 kWh today has an SoH of 90%. SoH is more useful for cross-vehicle comparison because it normalizes for pack size.
Why does the tool only go up to 93,000 miles with published data?
The Aviloo study reports medians at 50,000 km and 150,000 km. Beyond 93,206 miles, our estimator continues the trend along the study's slope and clearly flags the result as extrapolated. Published study data simply does not extend further, so we do not pretend it does.
Does climate really change battery degradation that much?
Yes. Repeated exposure to high ambient temperatures is one of the strongest predictors of accelerated capacity loss. A car from Phoenix will typically show more degradation than an identical model from Seattle at the same mileage. If you know a car's climate history, treat the study median as a starting point and adjust accordingly.
Methodology and Sources
Data Source
Model-level State of Health figures come from the Aviloo Certified EV Battery Report, an independent study covering more than 500,000 battery tests conducted between 2022 and 2026. The September 2026 edition reports medians for 20 EV models at 50,000 km (31,069 miles) and 150,000 km (93,206 miles).
How Our Estimator Works
For mileage between 31,069 and 93,206 miles, our estimator uses linear interpolation between the two published medians:
SoH = SoH31k + [(M − 31,069) ÷ (93,206 − 31,069)] × (SoH93k − SoH31k)
Projected range is calculated as rated range × (SoH ÷ 100). Mileage below 31,069 miles returns the study's 31,000-mile median. Mileage above 93,206 miles is projected along the study slope and flagged as extrapolated.
Limitations
Linear interpolation between two data points is an approximation. The study's underlying distribution is not perfectly linear, and a genuine measurement of any individual vehicle requires an OBD-based battery test. The median can also hide wide variation — Aviloo reports same-model, same-mileage vehicles can differ by as much as 13.5 percentage points.
About This Article
This guide was last reviewed in September 2026, aligned with the release of the Aviloo report. It is written for U.S. used-EV buyers. Warranty terms and model availability vary by country and model year, so please verify any coverage claims directly with the manufacturer or a franchised dealer before relying on them.
Disclaimer
The estimates in this article and in our estimator are statistical, not diagnostic. They reflect what is typical for a model at a mileage, not what is true about any specific vehicle. Before purchasing a used EV, obtain an independent battery health assessment through an OBD-based test or a certified diagnostic service such as an Aviloo Flash Test. This page does not provide financial, legal, or mechanical advice.
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