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Dealers Portal UK Editorial
Electric & Hybrid Motoring (2026)
How Long Do Electric Car Batteries Really Last? 2026 Degradation Guide
Dealers Portal UK Editorial
Real-world fleet telemetry reveals modern liquid-cooled EV batteries degrade at an average rate of only 1.5% to 2.2% per year. After 100,000 miles (approx. 7–8 years of driving), high-grade battery packs retain 85% to 92% of original capacity. Nearly all manufacturers provide an 8-year / 100,000-mile warranty guaranteeing at least 70% retention.
One of the most persistent misconceptions among used car buyers is fear of total battery failure. Modern thermal management and battery chemistry have proven that EV packs frequently outlive the mechanical life of the vehicle chassis.
| Vehicle Model & Chemistry | Average Mileage Tested | Remaining Capacity (SOH) | Manufacturer Battery Warranty |
|---|---|---|---|
| Tesla Model 3 / Y (NMC / LFP) | 100,000 miles | 88% – 92% SOH | 8 Years / 100,000 or 120,000 miles |
| Kia EV6 / Hyundai Ioniq 5 (NMC) | 75,000 miles | 90% – 93% SOH | 7 to 8 Years / 100,000 miles |
| Nissan Leaf (40kWh / 62kWh passive) | 60,000 miles | 82% – 86% SOH | 8 Years / 100,000 miles |
| Volkswagen ID.3 / ID.4 (NMC) | 80,000 miles | 87% – 91% SOH | 8 Years / 100,000 miles |
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Published and fact-checked in accordance with 2026 DVLA, DVSA MOT guidelines, and UK automotive marketplace standards.
Aug 20, 2026
