A large-scale study of electric vehicle battery performance in Sweden has delivered compelling evidence that Tesla Model 3 sedans equipped with lithium iron phosphate (LFP) battery packs maintain significantly higher capacity retention over high mileage compared to their nickel-based counterparts. Conducted by Swedish used-EV retailer Carla using AVILOO's battery diagnostics technology, the analysis examined 9,954 battery tests performed between 2022 and 2026, providing one of the most comprehensive real-world comparisons of EV battery chemistries to date.
LFP Packs Outperform Nickel-Based Alternatives by Five Percentage Points
The study's most striking finding reveals that Tesla Model 3 vehicles with CATL's LFP battery packs averaged 93.3% battery health after surpassing 62,000 miles (100,000 kilometers), outperforming all nickel-based variants in the dataset by at least five percentage points. This performance gap challenges long-held industry assumptions about the relationship between battery chemistry, cost, and durability.
Nickel-cobalt-aluminum (NCA) battery packs from Panasonic, traditionally marketed as Tesla's premium option, showed the highest degradation among the tested configurations. LG Chem's nickel-based packs performed better than Panasonic's NCA cells but still fell short of the LFP benchmark. The five-point difference in battery health between the best and worst-performing Model 3 variants represents a significant margin in the context of used-EV valuation and long-term ownership costs.
Fred Lambert, noted that these findings contradict conventional wisdom about battery technology: "The data fundamentally alters the narrative surrounding LFP chemistry. While LFP packs have historically been viewed as the budget option due to their lower energy density, this study demonstrates that they may actually represent the more durable choice for high-mileage applications."
Chemical Properties and Charging Behavior Drive Performance Differences
The performance disparity between LFP and nickel-based batteries can be attributed to fundamental differences in their chemical properties and recommended charging practices. Tesla advises owners of vehicles with nickel-based cells to limit daily charging to 80-90% of capacity to minimize degradation. In contrast, LFP packs can safely be charged to 100% without experiencing accelerated wear, providing both convenience and long-term benefits.
Over tens of thousands of miles, these charging practices compound to create measurable differences in battery health. Multiple independent studies and teardown analyses have consistently shown that LFP chemistry ages more gracefully than nickel-based alternatives under real-world conditions. The thermal stability of LFP cells further contributes to their longevity, as they exhibit greater resilience to stress from high temperatures and frequent fast charging compared to nickel-based chemistries.
These characteristics have made LFP batteries particularly attractive to fleet operators and high-mileage drivers. The Carla study provides the first large-scale, direct comparison within a single vehicle model, offering clear evidence of LFP's durability advantages in a controlled context.
Industry-Wide Trends Support LFP's Longevity Advantage
Carla's analysis extends beyond Tesla, ranking the 20 electric vehicle models with the highest average battery health among vehicles that have surpassed 62,000 miles. The Kia e-Niro and Hyundai Kona emerged as the top performers, with both models maintaining over 97% battery health. All 20 models in the ranking averaged above 91% health, indicating that modern EV batteries are demonstrating remarkable durability across multiple manufacturers and battery chemistries.
These findings align with broader industry data from fleet analytics firm Geotab, which analyzed battery performance across 22,700 vehicles. Geotab's research concluded that average annual battery degradation has improved to approximately 1.8% per year, suggesting that contemporary EV batteries could potentially last 20 years or more—significantly outlasting the vehicles they power.
Tesla's internal data corroborates these trends. The company has reported that Model 3 and Model Y Long Range battery packs lose roughly 15% of their capacity after 200,000 miles, with most degradation occurring early in the battery's lifecycle before the rate of capacity loss stabilizes. While Tesla's figures do not differentiate between battery chemistries, the Carla study provides crucial context, demonstrating that LFP packs may degrade even more slowly than Tesla's general estimates for its vehicle lineup.
Market Implications for Used-EV Buyers and Automakers
The study's findings carry significant implications for the rapidly growing used electric vehicle market. Buyers evaluating two otherwise identical 2022 Tesla Model 3 vehicles with comparable mileage and pricing may encounter a five-point difference in battery health depending on whether the vehicle is equipped with an LFP or nickel-based pack. This disparity can substantially impact the vehicle's long-term value and operating costs, yet this critical information is not typically disclosed on standard vehicle listings.
Lambert emphasized the importance of battery diagnostics tools in this context: "The window sticker provides no indication of which battery chemistry a particular Model 3 contains. Buyers must rely on tools like AVILOO's diagnostics or Tesla's own battery health reports to make informed decisions about used EV purchases."
For Tesla, the study reframes the company's strategic shift toward LFP batteries in its Standard Range Model 3 and Model Y vehicles. While this transition was initially motivated by cost considerations and nickel supply constraints, the durability benefits revealed by the Carla study suggest that LFP-equipped vehicles may offer superior long-term value to owners. This development could enhance the appeal of Tesla's entry-level models, despite their lower range compared to higher-spec variants.
The Carla study does not address whether similar performance trends apply to other Tesla models or battery chemistries beyond the Model 3. However, the consistency of its findings with Geotab's broader dataset and Tesla's internal reports suggests that LFP's longevity advantages may be applicable across the electric vehicle industry. As automakers increasingly adopt LFP technology for its cost-effectiveness and supply chain benefits, the chemistry's demonstrated durability could emerge as a key selling point for both budget-conscious consumers and high-mileage operators.
