Electric vehicles (EVs) are seen all over O’Fallon’s roads—from the school drop-off line to the commute to St. Louis. But one question keeps popping up: "How long will my EV battery actually last?"
Unlike gas engines that wear out over time, EV batteries degrade slowly—but they don’t just die overnight. Let’s break down how they work, what wears them out, and how you can maximize your battery’s life so you’re not left stranded on I-64.
And when your EV needs expert care, Hillside Auto Repair has you covered with dealership-grade tools, certified technicians, and a 3-year/36,000-mile warranty on all services.
How Do EV Batteries Work (And Why Do They Degrade?)
EV batteries are lithium-ion powerhouses, storing energy to propel your car without a drop of gasoline. Unlike your phone battery (which might quit after two years), EV batteries are built to last—most automakers guarantee them for 8-10 years or 100,000+ miles.
But over time, repeated charging and discharging cause tiny chemical changes that reduce capacity. Think of it like a coffee filter—it still works after many uses, but slowly loses efficiency.
What Kills EV Batteries Faster?
Extreme Temperatures (Hello, Missouri Summers & Winters!)
O’Fallon’s sweltering summers and chilly winters aren’t ideal for lithium-ion batteries. Heat accelerates degradation, while cold temporarily reduces range. Parking in a garage helps, and preconditioning your battery (warming/cooling it while plugged in) can extend its life.
Fast Charging Too Often
Fast chargers (like those at the Schnucks on Highway K) are great for road trips but can stress the battery if used daily. For everyday charging, Level 2 (240V) home charging is gentler.
Always Charging to 100% (Or Draining to 0%)
Keeping your battery between 20% and 80% is ideal for longevity. Most EVs let you set a charge limit—use it!
Heavy Loads & Aggressive Driving
Towing a boat to Lake St. Louis? Frequent heavy loads strain the battery. And jackrabbit starts? They don’t just drain range—they also add wear.
How to Make Your EV Battery Last Longer
✔ Avoid constant fast charging – Save it for trips.
✔ Don’t leave it at 100% for days – Set a charge limit.
✔ Park in shade or a garage – Extreme heat is a killer.
✔ Use regenerative braking – It reduces battery strain.
✔ Keep up with software updates – Many improve battery management.
When Should You Replace an EV Battery?
Most EVs still hold 70-80% capacity after a decade. If your range drops drastically (like struggling to get from O’Fallon to Chesterfield on a charge), it might be time for a checkup.
And if your EV ever needs expert care, Hillside Auto Repair is your go-to for top-tier EV maintenance, diagnostics, and repairs—all backed by a 3-year/36,000-mile warranty.
EV batteries are tougher than you think—but a little care goes a long way. After all, the only thing that should be draining in O’Fallon is your coffee after a long drive. ☕🚗
What’s your biggest EV battery worry? Range loss? Charging habits? Let us know!