How EV Battery Degradation Is Estimated
EV battery capacity naturally decreases with each charge cycle. This calculator estimates annual degradation starting from a 1.5% baseline, then adjusts for your charging frequency with DC fast chargers, your typical charge target, and your local climate. Frequent fast charging, always charging to 100%, and extreme temperatures all accelerate degradation.
When capacity falls below 70% of the original, driving range drops noticeably and battery replacement becomes worth considering. Many manufacturers warranty their packs down to that threshold, so check your vehicle's coverage terms.
Frequently Asked Questions
Yes. Lithium-ion cells experience more chemical stress at high states of charge. Staying below 80% daily reduces that stress and can extend usable battery life by several years.
Occasional fast charging is fine and is a key benefit of owning an EV. The problem is relying on it daily — the higher current generates more heat and accelerates cell wear over time.
This tool provides an estimate based on widely cited degradation factors. Actual results vary by battery chemistry, vehicle model, and individual usage. Use it as a planning guide, not a guarantee.