For years, one of the biggest questions surrounding electric vehicles has been what happens to their batteries after the new-car excitement wears off. Ford now has some reassuring answers.
In findings released on November 9, 2026, the automaker revealed that more than 36,000 Mustang Mach-E electric SUVs from the 2021 model year retained an average of 92% of their original usable battery capacity after approximately five years of ownership. Together, the vehicles have travelled roughly two billion miles across the United States and Canada.
The results challenge concerns that electric vehicle batteries deteriorate rapidly with age. They also provide valuable insight into how driving habits, mileage, and battery technology influence long-term reliability, particularly as the first generation of mainstream electric vehicles enters the used-car market.
A Five-Year Test Spanning Two Billion Miles
Ford’s latest findings come from an extensive examination of Mustang Mach-E vehicles delivered during the 2021 model year. The automaker analyzed battery health information from approximately 36,000 electric SUVs sold to retail customers and fleet operators across the United States and Canada. With an average ownership period of 5.2 years, these vehicles have accumulated roughly two billion miles, equivalent to more than 3.2 billion kilometres. That works out to approximately 55,000 miles per vehicle, although individual driving distances vary considerably across the group.
What makes this examination particularly valuable is its reliance on actual driving conditions rather than laboratory simulations alone. These vehicles have experienced everything from freezing Canadian winters to intense summer temperatures, along with daily commuting, long-distance travel, and different charging routines. Ford collected the information through aggregated, anonymized connected-vehicle data, allowing engineers to assess usable battery capacity across a substantial portion of its original Mach-E fleet. While the findings are manufacturer-reported rather than independently audited results for every vehicle, they provide a meaningful picture of long-term electric vehicle durability.
Most Mach-E Batteries Remain Between 87% and 97% Health
Although the average battery health figure of 92% has attracted considerable attention, Ford’s analysis reveals another important finding. Approximately 95% of the vehicles examined retained between 87% and 97% of their original usable battery capacity after five years. This relatively concentrated range suggests that substantial battery deterioration has not been the typical experience for owners of the first-generation Mustang Mach-E. It also provides a clearer understanding of how much variation exists between vehicles that have spent years operating under different conditions.
Kevin Vander Laan, Ford’s technical leader of high-voltage battery cells and systems, emphasized that understanding the distribution of results is just as important as examining the average. A battery retaining 97% capacity is in a different position from one retaining 87%, even when both vehicles share the same model year. For prospective used-EV buyers, that distinction matters. Ford’s public summary does not provide a complete breakdown of the remaining 5% of vehicles outside the reported range, making individual battery-health assessments particularly valuable when evaluating older electric SUVs.
What 92% Battery Capacity Actually Means for Driving Range
Battery health is not the same as the charging percentage displayed on a vehicle’s dashboard. When Ford reports 92% battery health, it means the battery can store approximately 92% of the usable energy it could hold when new. A five-year-old Mustang Mach-E can still display a full 100% charge, but that charge may represent slightly less stored energy than it did during the vehicle’s first year. For example, an electric vehicle that originally travelled 400 kilometres under a particular set of conditions might theoretically manage around 368 kilometres with 8% less usable battery capacity, assuming its energy efficiency remained unchanged.
Actual driving range, however, depends on considerably more than battery capacity alone. Highway speeds, freezing temperatures, cabin heating, tire conditions, and driving habits can all influence how far an electric vehicle travels between charging sessions. Software updates and battery-management strategies can also affect available range. This distinction is particularly relevant for Canadian drivers, who frequently experience substantial seasonal differences in EV efficiency. A shorter range estimate during a cold winter morning does not necessarily indicate permanent battery deterioration. Ford’s findings measure usable battery capacity, meaning they should not be interpreted as proof that every Mach-E has experienced an identical reduction in real-world driving distance.
More Than 2,000 Mach-Es Have Passed 100,000 Miles With Strong Battery Health
One of the most revealing findings concerns Mustang Mach-E owners who have accumulated substantially more mileage than the average driver. Ford identified more than 2,000 vehicles from the 2021 model year that had travelled beyond 100,000 miles, equivalent to approximately 160,000 kilometres, while retaining their original battery packs. Remarkably, those vehicles maintained average battery health above 91%. That is only about one percentage point below the average recorded across the entire fleet, despite having travelled considerably farther than the typical vehicle included in the analysis. The findings suggest that heavy driving does not necessarily translate into rapid battery deterioration.
This milestone is particularly significant because 100,000 miles represents the mileage limit of Ford’s standard high-voltage battery warranty in the United States, with the Canadian equivalent set at 160,000 kilometres. For drivers who depend on their vehicles for lengthy commutes, business travel, or other demanding activities, the results provide encouraging evidence about long-term usability. A battery retaining more than 90% of its original capacity can continue supporting substantial daily travel without requiring replacement solely because of normal aging. However, Ford’s aggregated results do not establish precisely how charging frequency, climate, and individual driving conditions affected each high-mileage vehicle.
Even Mach-Es With More Than 200,000 Miles Are Retaining 88% Capacity
Ford’s findings become even more remarkable when examining the highest-mileage vehicles in the group. More than 30 Mustang Mach-Es from the 2021 model year have exceeded 200,000 miles, or approximately 320,000 kilometres. According to the automaker, those vehicles retain an average of 88% of their original usable battery capacity. Although this represents a greater decline than the overall fleet average, it remains a relatively modest reduction considering the extraordinary distance travelled. Many privately owned vehicles take well over a decade to accumulate comparable mileage, making the durability demonstrated by these heavily used electric SUVs particularly noteworthy.
An individual example also helps illustrate what extended EV ownership can look like. David Blenkle, who operates a private car service in Santa Cruz, California, surpassed 400,000 miles, or more than 640,000 kilometres, in his 2022 Mustang Mach-E while continuing to use its original battery. Ford confirmed that milestone in October 2026. His vehicle belongs to a different model-year group and is not part of the 2021 cohort analyzed for the 92% figure. Nevertheless, his experience demonstrates that exceptionally high mileage is possible without an automatic need for battery replacement. Such cases remain unusual and should not be interpreted as guarantees that every electric vehicle will achieve similar longevity.
Battery Chemistry and Thermal Management Play Important Roles
The batteries powering the original 2021 Mustang Mach-E use nickel-cobalt-manganese lithium-ion chemistry, commonly abbreviated as NCM or NMC. This technology offers a balance of energy density and performance, helping manufacturers provide substantial driving range without excessively large battery packs. Ford subsequently introduced lithium-iron-phosphate, or LFP, battery technology in certain newer Mustang Mach-E configurations. LFP batteries generally offer longer cycle life and use less expensive materials, although they typically have lower energy density. These chemical differences influence how batteries respond to charging, temperature, and repeated use, making battery-specific maintenance recommendations important.
Beyond chemistry, battery degradation occurs through two main processes. Calendar aging happens gradually as battery cells change over time, even when vehicles are not being driven. Cycle aging occurs through repeated charging and discharging. Academic research has established that temperature, charge levels, and operating conditions influence both processes. Modern electric vehicles use sophisticated battery-management software and thermal systems to maintain appropriate operating conditions and reduce excessive stress. Ford’s analysis does not identify one particular engineering feature responsible for the Mach-E’s strong results. Instead, it demonstrates how the complete battery system performs after years of exposure to real-world conditions, providing valuable feedback for engineers developing future electric vehicles.
Charging Habits and Extreme Temperatures Can Still Affect Battery Life
Although Ford’s findings indicate that Mustang Mach-E batteries are aging relatively well, charging behaviour remains an important consideration. A January 2026 analysis by Canadian telematics company Geotab examined more than 22,700 electric vehicles across 21 makes and models and found an average annual battery degradation rate of 2.3%. Vehicles relying heavily on high-powered DC fast charging above 100 kilowatts experienced degradation rates approaching 3% annually, compared with approximately 1.5% for vehicles primarily using slower charging methods. The research also found that vehicles operating in hotter climates experienced somewhat faster battery deterioration than those in milder environments.
For Mustang Mach-E owners, Ford recommends using Level 2 charging for everyday needs and reserving DC fast charging for situations where quicker replenishment is necessary. Other practical measures include preconditioning the vehicle while connected to a charger and avoiding excessive heat when possible. The company also recommends following battery-specific charging limits. The NCM batteries fitted to 2021 Mach-Es generally benefit from limiting routine charging to around 90%, while certain newer LFP batteries benefit from occasional full charging to maintain accurate battery-management calibration. These recommendations are designed to support long-term durability without making ownership unnecessarily complicated. Geotab’s broader findings also indicate that occasional full charges are less concerning than repeatedly leaving batteries near extremely high or low charge levels for prolonged periods.
Independent Battery Research Supports Ford’s Findings
Ford’s results are consistent with a growing body of independent research suggesting that modern electric vehicle batteries are considerably more durable than many early concerns implied. In September 2026, battery-diagnostics company AVILOO released findings from more than 500,000 battery-health tests covering 20 popular electric vehicle models. Its analysis found that the Mustang Mach-E retained a median battery state of health of approximately 92.5% after 150,000 kilometres. While this figure is remarkably close to Ford’s reported average, the studies used different methodologies. AVILOO compared battery health at specific mileage intervals across multiple model years, whereas Ford examined a particular group of 2021 vehicles after approximately five years.
Additional research from EV analytics company Recurrent also points toward relatively slow deterioration in real-world driving capability. Its January 2026 findings estimated that the average electric vehicle retains approximately 95% of its original driving range after five years. Importantly, Recurrent distinguishes range retention from battery capacity because software and vehicle energy-management systems can influence the distance available to drivers. These differences matter when interpreting industry-wide results. A manufacturer-reported battery-health measurement, an independent diagnostic assessment, and a modelled driving-range estimate are not identical measures. Nevertheless, their broadly consistent findings suggest that significant early battery deterioration is not inevitable across modern electric vehicles.
Ford’s Eight-Year Battery Warranty Provides Additional Protection
For Canadian Mustang Mach-E owners, the manufacturer’s battery warranty offers an important level of protection against excessive deterioration. Ford provides high-voltage battery coverage for eight years or 160,000 kilometres, whichever occurs first. Under the applicable warranty terms, battery capacity falling below 70% of its original level during the coverage period is considered excessive degradation. In the United States, the equivalent coverage lasts eight years or 100,000 miles. The average 92% battery health reported across Ford’s five-year-old Mach-E fleet is comfortably above that threshold, suggesting that the typical vehicle in the study has not approached the point where capacity loss alone would trigger a warranty remedy.
However, warranty protection should not be confused with a guarantee that batteries will retain their original performance indefinitely. Normal capacity loss is expected, and a battery retaining 80% of its original capacity would not automatically qualify for replacement under the excessive-degradation provision. Coverage for manufacturing defects is a separate consideration, subject to the warranty’s terms and exclusions. For used-car buyers, the original warranty start date, mileage, and service history remain important factors when evaluating potential protection. Ford also states that its battery systems are designed to last at least 10 years, although that engineering objective should not be mistaken for an extension of the manufacturer’s standard warranty period.
Stronger Battery Durability Could Improve Confidence in Used EVs
Battery health is becoming an increasingly important consideration as more first-generation electric vehicles enter the used-car market. Buyers considering an older Mustang Mach-E must evaluate not only the vehicle’s mileage, condition, and equipment but also how much usable energy its battery can still store. Ford’s findings provide a useful reference point for those decisions. Knowing that approximately 95% of the analyzed 2021 Mach-Es retained between 87% and 97% battery health can help establish reasonable expectations. However, a vehicle-specific assessment remains essential because battery condition can vary even among cars of the same age and model.
Independent diagnostic services are also helping make these evaluations more transparent. Companies such as AVILOO provide battery-health assessments using information collected from vehicle systems, offering buyers a way to compare an individual battery with similar vehicles. For someone purchasing a used electric SUV, an independently verified battery-health report may be more informative than relying exclusively on the estimated range displayed during a test drive. It can also support more informed negotiations between buyers and sellers. Stronger long-term battery data could ultimately help reduce uncertainty surrounding used EV values, although resale prices will continue to depend on factors including market demand, technology changes, vehicle condition, and overall ownership costs.
Ford’s Findings Could Shape the Next Generation of Electric Vehicles
The significance of Ford’s battery analysis extends beyond the original Mustang Mach-E. The automaker says information collected from vehicles operating under real-world conditions helps guide improvements to battery-management systems, charging recommendations, and future electric vehicle development. That includes work associated with its Universal Electric Vehicle platform and the upcoming Ford Fathom electric pickup. Ford also reports that, across its broader battery-electric lineup in the United States and Canada, battery packs retain more than 90% health on average after 100,000 miles. Those results offer additional encouragement, although different vehicle models and battery chemistries may age at different rates.
For consumers, the findings provide another reason to distinguish normal battery aging from outright battery failure. Losing a modest percentage of usable capacity over several years does not mean an electric vehicle has reached the end of its practical life. At the same time, Ford’s five-year results cannot establish what every Mustang Mach-E will look like after 15 or 20 years, particularly because individual charging habits, environmental exposure, and maintenance histories differ. Continued long-term monitoring will be necessary to answer those questions. For now, the evidence suggests that the original Mustang Mach-E’s battery is proving to be a relatively durable component, supporting the possibility of many additional years of useful electric driving.
