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Ford says 36,000 Mustang Mach-E SUVs average 92% battery health after five years, and 2,000-plus cars past 100,000 miles keep over 91%. The figures are Ford's own, not an audit.
Energy & Cooling DeskEdited by Ege Erten
2 min readAI-assisted
Ford's fleet figures for the 2021 Mustang Mach-E, as reported by InsideEVs, Carscoops and Forbes.
Illustration (AI-generated)
Ford said on Nov 9, 2026 that about 36,000 model-year 2021 Mustang Mach-E SUVs in the US and Canada average 92% battery state of health after roughly five years, with the 2,000-plus cars past 100,000 miles still above 91%.
The data covers the whole 2021 fleet still on the road, which has driven about two billion cumulative miles, according to Ford's account carried by InsideEVs, Carscoops and Forbes. Ford said 95% of the cars sit between 87% and 97% health. InsideEVs reported that the average car had covered 55,000 miles in 5.2 years, so the 100,000-mile group drove about twice the typical distance with little extra loss.
Ford counted more than 30 cars past 200,000 miles, averaging 88% health, and Kevin Vander Laan, Ford's technical leader for high-voltage battery cells and systems, called the dataset "one of the most valuable feedback loops we have had at this scale," according to Carscoops. All the studied cars use nickel-cobalt-manganese (NCM) cells, InsideEVs said, because Ford did not offer a lithium-iron-phosphate (LFP) Mach-E pack until the 2023 model year.
InsideEVs worked out that a top-trim 2021 Mach-E rated at 305 miles by the EPA would in theory be good for about 280 miles today at 92%. By Voltgrid's arithmetic, an 8-point loss over 5.2 years is about 1.5 points a year on average, though degradation is rarely linear and Ford did not publish a year-by-year curve.
The fleet result also lands close to Ford's earlier design claim. Ford Authority reported in 2025 that Ford designs Mach-E packs to last at least 10 years and keep 90% of original capacity at 100,000 miles, based on its own field-data study. The over-100,000-mile group at above 91% is consistent with that target.
State-of-health readings from different tools are not interchangeable, so the comparisons below are context rather than a ranking. InsideEVs cited battery-testing firm Aviloo, which measured 92.5% for the Mach-E in a September study of 500,000 EV tests, against 88.9% for the Tesla Model 3 and 90.3% for the Model Y. Forbes cited Recurrent, which found its tracked Tesla vehicles averaging 86% battery health at 100,000 to 150,000 miles.
InsideEVs noted that hot climates and frequent fast charging to 100% tend to age packs faster. Ford recommends shade parking, cabin preconditioning while plugged in, Level 2 charging for daily use and sparing use of DC fast charging.
The figures are averages from Ford's own fleet data, not an independent audit, and the reports do not describe how Ford measures state of health. Ford gave no battery health figure for the 400,000-mile car of owner David Blenkle, saying only that the pack has "remained strong," according to Carscoops. Ford also did not say whether the results change its battery warranty terms.
