Used Tesla Model 3 With Unknown History Reveals LFP Battery Degradation Data at 78,000 Miles
InsideEVs documents real-world capacity loss on a high-mileage Tesla with an LFP pack and unclear service records.
A used Tesla Model 3 equipped with an LFP battery pack and approximately 78,000 miles has provided a real-world look at long-term degradation on the chemistry, according to testing documented by InsideEVs.
What Happened
The publication acquired a Tesla Model 3 with a lithium iron phosphate (LFP) battery that had accumulated roughly 78,000 miles with an unclear service and charging history. Testing was conducted to measure the pack's current capacity and assess degradation compared to its original specifications. The results offer insight into how LFP cells perform under real-world conditions in a high-mileage application where the vehicle's prior usage patterns were unknown.
Why It Matters
LFP batteries have become increasingly common in EVs, including Tesla vehicles sold in certain markets and model years, due to their cost advantages and tolerance for regular charging to 100 percent. Understanding degradation rates helps used EV buyers assess battery health and make informed purchasing decisions, particularly when a vehicle's history is unclear. For owners and potential buyers of pre-owned Teslas with LFP packs, the data provides a benchmark for what to expect as mileage climbs.
The Bottom Line
The testing demonstrates that LFP batteries can sustain significant mileage while retaining usable capacity, though degradation varies based on charging habits and environmental factors. Buyers of used EVs should request battery health reports or perform independent testing before purchase, especially when service records are unavailable.
