- The four-year-old Model 3’s LFP battery retained 92% health after nearly 78,000 miles.
- Its previous charging history was unknown, making the healthy result particularly reassuring.
- Charger data couldn’t reliably verify the result, so Tesla’s official battery-health score remains the best estimate.
Most EV batteries age more gracefully than you might expect—certainly more so than those in Nissan Leafs—but their state of health can still make the difference between a used EV that’s a bargain and one that foreshadows a five-figure repair bill. Knowing an EV’s charging history and battery health percentage is vital when buying it used, which is why this second-hand Tesla Model 3 purchase looked like a bit of a gamble.
