EV Battery Degradation From Driving Style 2026: What the Shanghai Dianji University Study Found

© A. Krivonosov

Constant hard acceleration may affect an electric vehicle's battery life more than previously thought, but the “2.5 times” figure comes with an important caveat. Researchers at Shanghai Dianji University didn't measure this after physically wearing out batteries over 1,000 cycles — they derived it from a model built on real-world driving data. The work was published on August 14, 2026, in Scientific Reports.

The scientists studied a year of telemetry from 15 electric vehicles operating in Guangzhou and split driving style into five levels. In the most aggressive style, average effective current reached 66.02 A, versus 20.56 A for calm driving. The calculated short-term stress on the battery was 18.4 times higher. Average speed didn't differ significantly between the groups — the key factor was repeated demand for high current: intense acceleration followed by braking.

When these patterns were fed into an aging model, the projected capacity loss after 1,000 cycles came to 21.15% for the calmest style and 53.22% for the most aggressive — the source of that roughly 2.5x gap. In a counterfactual calculation, switching to a calmer driving style cut short-term stress by 91.3%.

That doesn't mean a few full-throttle launches will noticeably damage a battery. The sample is limited to 15 cars in one city, and the underlying data didn't account for factors like vehicle load, road grade, or full charging history. So the study shows a strong correlation and a plausible direction of effect, but it can't promise a specific battery lifespan for any given EV.

For owners, the logic of careful use now extends beyond temperature, fast charging, and prolonged storage at a high state of charge. Frequent hard acceleration is also worth factoring in. The next step should be testing across more vehicles, different battery chemistries, and a range of climates.