How Battery SOH Affects Your EV's Range
An EV's range degrades as the battery's maximum capacity decreases. Estimated Current Range = Rated Range × (SOH / 100). At 90% SOH, a 280-mile EV has approximately 252 miles of range — a 28-mile reduction. This loss accelerates as SOH drops below 80%.
The US federal mandate (EPA) requires EV manufacturers to warrant batteries at 70% SOH for 8 years/100,000 miles. After this threshold, range loss becomes noticeable enough to affect everyday usability. Battery replacement costs $5,000–15,000 depending on capacity and brand.
Frequently Asked Questions
Research from Recurrent and other sources shows average degradation of 2–3% SOH per year under normal use. Heavy DC fast charging, extreme heat, and consistently charging to 100% accelerate degradation.
Yes. Keep daily charging between 20–80%, avoid DC fast charging as your daily habit, park in shade in hot weather, and use scheduled charging to avoid sitting at 100% for extended periods.
At 85% SOH, range loss is about 15% — manageable for most drivers. Check the battery warranty transfer status and whether the manufacturer's warranty still covers the remaining useful life.