Ford's 2021 Mach-E Fleet Still Holds 92% Battery Health
By @sharedot · · 6 pages
- Automotive
- EV Battery Health
- Mustang Mach E
Ford's five-year study of 36,000 2021 Mustang Mach-Es found an average 92% battery state of health after roughly 2 billion cumulative electric miles.
What Ford Found After Five Years
Ford published a study of battery state-of-health data for the entire 2021 model-year Mustang Mach-E fleet: more than 36,000 electric SUVs sold across all 50 US states and Canada, averaging 5.2 years of ownership.
After an estimated 2 billion cumulative all-electric miles — a distance Ford likened to reaching Neptune — the fleet retained an average of 92% battery health, with 95% of vehicles falling between 87% and 97%.
As of August 2026, the figures reflect usable battery capacity for retail and fleet customers.
The High-Mileage Outliers
The data's tail is what enthusiasts will talk about. More than 2,000 Class of 2021 owners crossed 100,000 miles on their original battery, averaging better than 91% health, and over 30 drivers passed 200,000 miles while averaging 88%.
CleanTechnica relays Ford's account of David Blenkle, whose 2022 Mach-E has driven past 400,000 miles on its original battery with health still considered strong.
One owner's extreme case could have been dismissed as an outlier, but the fleet-wide numbers suggest his experience is part of a broader pattern of durable packs.
Why It Matters and How It Compares
Battery longevity has long been the biggest fear for EV fence-sitters and used-car shoppers, since the pack is the most expensive component.
CNET's Antuan Goodwin notes the results align with industry-wide reports, citing an independent Aviloo study of over 500,000 EVs that found the Tesla Model Y at about 90.3% health at 150,000 km, the VW ID4 at 90.6% and Hyundai Ioniq 5 at 92.8%, while the first-gen Nissan Leaf lagged at 86.3%.
Ford says its full battery-electric lineup maintains over 90% health on average at 100,000 miles, and its packs are designed to last at least 10 years.
What Comes Next for Ford's Batteries
The 2021 Mach-E uses older nickel-cobalt-manganese (NCM) chemistry, which generally doesn't need frequent full charges.
Ford's upcoming Universal Electric Vehicle platform, underpinning the Fathom small electric pickup, shifts to lithium iron phosphate (LFP) chemistry, which benefits from occasional 100% charges to keep the battery management system calibrated — different charging guidance for a different generation.
Ford adds that the UEV architecture is built around robust bidirectional charging, and engineers say we'll need to check back in about five years to see how vehicle-to-home power affects long-term battery health.