Quick answer: far longer than most people fear. Modern EV batteries typically lose only around 1.5–2% of capacity per year, most manufacturers guarantee at least 70% capacity for around 8 years or 160,000 km, and real-world data increasingly shows packs outliving the cars around them. The battery you should worry about is the abused one – not the old one.
What “degradation” actually means
A battery doesn’t die the way a phone screen cracks. It fades: each year it can hold slightly less energy than when new, which means slightly less range. A car that started with 400 km of range and has lost 10% now does 360 km. It still drives exactly the same – it just visits chargers a little more often. Degradation is fastest in the first year or two (an early “settling” drop), then flattens into a slow, predictable decline.
What actually ages a battery
Four things do most of the damage: living at 100% charge (parking fully charged for days), regular DC fast-charging as the main charging method, sustained heat (hot climates without good battery cooling), and deep cycling from 0% to 100% routinely. Notice what’s not on the list: age itself, moderate mileage, and normal driving. A gently used high-mileage EV can have a healthier pack than a low-mileage car that sat fully charged in the sun.
Five habits that keep a pack young
Keep daily charging between roughly 20% and 80% and save 100% charges for trip days. Charge slowly at home when you can and treat fast charging as a travel tool, not a lifestyle. Park in shade in summer. Don’t leave the car sitting for weeks at either a full or empty battery. And simply drive it – batteries prefer regular gentle use over long idle spells.
When does replacement actually make sense?
Rarely. Below about 70–75% health, daily range may start to genuinely pinch, and that’s the point where owners consider options: a warranty claim if the drop happened early, a used or refurbished pack, or module-level repair, which a growing number of independent specialists now offer at a fraction of dealer prices. For most owners, though, the honest answer is that the car will change hands – possibly twice – before the battery becomes the story.
Shopping used? Run our 12-point EV battery health inspection before you pay, see the full used EV buying checklist, and compare how much usable range today’s models keep in our longest-range EV ranking.
Related: for typical pack lifespans and what each carmaker’s warranty covers, see how long EV batteries last – lifespan & warranties.
