Ford Reports 92% Battery Health in 2021 Mach-Es; U.S. Capacity Coverage Ends at 100,000 Miles

Ford says its 2021 Mustang Mach-E fleet has retained 92% of usable battery capacity on average after roughly five years. But its original U.S. capacity-loss warranty ends after eight years or 100,000 miles, whichever comes first. That distinction matters because more than 2,000 original-battery Mach-Es in Ford's new study have already passed the mileage limit, even as Ford reports average battery health above 91% for that group.¹²

The November 9, 2026 report, written by a Ford battery-systems technical leader, covers approximately 36,000 model-year 2021 vehicles sold to U.S. and Canadian retail and fleet buyers. The connected-vehicle readings are from August 2026, when the cohort's average time in service was 5.2 years. These are Ford-reported fleet data, not an independently administered test of every vehicle's remaining usable capacity.¹

How the reported battery health compares with the original warranty

Ford-reported population or provision	Reported figure	What it actually tells a used buyer
All roughly 36,000 2021 vehicles	92% mean usable capacity	A cohort average, not an individual-car reading or warranty decision.1
Middle 95% of Ford's reported cohort	87%–97% capacity	The lower boundary of this band is 17 percentage points above Ford's U.S. 70% capacity-loss threshold. Ford did not characterize the remaining 5% in this disclosure.12
More than 2,000 vehicles past 100,000 miles on original batteries	Above 91% mean capacity	Their reported mileage has passed the ordinary U.S. capacity-loss coverage limit, even though their group average is far above the replacement-or-repair threshold.12
More than 30 vehicles past 200,000 miles on original batteries	88% mean capacity	A small, high-mileage subset, not an estimate of every Mach-E's future lifespan.1
Ford's original U.S. 2021 capacity-loss provision	Below 70%, within 8 years / 100,000 miles	The applicable capacity measurement must be determined by an authorized EV Certified Ford dealer using Ford's methodology.2

The simple subtraction is informative but limited: the 92% fleet mean is 22 percentage points above the 70% threshold; the 87% lower end of Ford's disclosed 95% band is 17 points above it. Neither comparison means an individual 2021 Mach-E will retain either percentage, qualifies for a repair, or can lose exactly that many additional points before a future claim.¹²

Ford's June 2021 second-printing U.S. warranty guide, on printed page 12, defines excessive battery capacity loss as less than 70% of beginning-of-life capacity during the specified coverage period. If its EV-certified dealer confirms qualifying excessive loss, Ford covers necessary component repair or replacement. The booklet gives Ford discretion over whether to repair, replace, recondition or use remanufactured components; it does not promise a new pack for every reading below 70%.²

This warranty rule is also not the same as the wider battery/eDrive component warranty against covered defects. A battery can be performing below its original capacity without meeting Ford's excessive-capacity-loss definition. And a battery with a good measured state of health can be beyond the capacity-loss warranty's mileage limit.²

What to check before buying a 2021 Mach-E

Check the specific vehicle, not the study average. Ford's 2021 booklet says a used purchaser can receive any remaining coverage. The coverage clock begins at the original delivery or first entry into service, whichever occurred earlier—not the date a second owner bought it. Compare that first-in-service date and the actual odometer against the applicable booklet and vehicle record, then ask for a vehicle-specific traction-battery health assessment. Ford's own warranty decision relies on an EV-certified dealer's measurement rather than an extrapolation from displayed miles of range.²

Our used-EV battery-health testing guide distinguishes state of health from a dashboard's state of charge and other battery reports. Our used-EV battery-warranty guide explains why the exact vehicle/model-year terms, transfer status and remaining mileage matter; neither guide substitutes for confirming the particular 2021 Mach-E's booklet and VIN.

One more scope limit: Ford's reported five-year group uses nickel-cobalt-manganese (NCM) battery packs. Its own post distinguishes those packs from later Ford lithium-iron-phosphate (LFP) batteries, which have different charging guidance. And because the reported fleet includes Canadian vehicles while the document compared here is Ford's U.S. warranty edition, these U.S. coverage conditions must not be treated as a blanket Canadian warranty statement.¹²

Ford's data offer useful evidence that many early Mach-E batteries have retained substantial usable capacity. They do not reveal an individual vehicle's battery condition, the total number of battery replacements, a warranty-claim rate or the future degradation trajectory of any particular pack.¹

Sources

Footnotes

1. Ford Motor Company, Kevin Vander Laan, “Five Years In, Mustang Mach-E Battery Data Shows What Real-World Electric Vehicle Durability Looks Like”, published November 9, 2026; fleet snapshot August 2026. Original interested-party report of connected-vehicle battery-health observations and high-mileage cohorts, not independent vehicle testing. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹

2. Ford Motor Company, “2021 Model Year Battery Electric Vehicle Warranty Guide (Mustang Mach-E),” second printing, June 2021, original U.S. manufacturer warranty booklet; first-in-service terms at printed p. 2, used-owner coverage in introduction, EV component coverage printed p. 11 and high-voltage battery capacity coverage printed p. 12 (PDF page index 16). Applies to the specified U.S. edition, not every VIN or Canadian coverage booklet. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹