They Bought a 78,000-Mile Tesla with an Unknown Past. Then They Tested the Battery.
InsideEVs examined a used Model 3's LFP pack to see how the battery held up after high mileage with unclear history.
Buyers shopping for used Teslas often face a frustrating gap: limited insight into how the previous owner treated the vehicle—and whether hidden abuse might lurk beneath the surface.
What Happened
InsideEVs obtained a Tesla Model 3 with approximately 78,000 miles on its odometer and an unclear service history. The publication conducted a detailed examination of the vehicle's LFP (lithium iron phosphate) battery pack to assess degradation levels and overall health after the high mileage and unknown usage patterns.
Why It Matters
LFP batteries have become standard in many Tesla base models, prized for their durability and ability to be regularly charged to 100% without significant long-term capacity loss. However, even robust chemistry can suffer under adverse conditions—extreme temperatures, chronic deep discharging, or neglected cooling system issues can accelerate wear regardless of cell type. For prospective buyers evaluating the used EV market, understanding real-world degradation at this mileage milestone provides concrete data for assessing value and longevity expectations.
The Bottom Line
Battery health testing on high-mileage Teslas with unknown histories offers valuable transparency for the used EV market, helping buyers make informed decisions about one of the most expensive components to replace.
