EV Battery Degradation Calculator
Wondering how much range your EV will lose over time? Enter your current range, the years ahead and your charging habits, and this tool estimates how much range your battery will keep over the years.
Estimate based on typical degradation of about 2% per year (real-world studies average around 2.3%). Actual loss varies with climate, charging habits and model. Most EVs warranty the battery to about 70% capacity for 8 years or roughly 100,000 miles.
How it works
How EV batteries lose range over time
An EV battery does not fail one day. It fades slowly. Each charge cycle wears the cells a little, so the pack holds slightly less energy every year and the car covers fewer miles on a full charge. Most EVs lose around 2 percent of capacity per year, and large real-world studies put the average closer to 2.3 percent. The drop is usually fastest in the first year or two, then settles into a slow, steady decline. This calculator uses a simple yearly rate to show roughly where you land after the years you pick, and our deep dive on how long an EV battery lasts covers the full picture.
What speeds up or slows degradation
Three things do most of the damage. Heat is the big one, so hot climates and parking in full sun age a battery faster. Frequent DC fast charging adds stress because it pushes a lot of power through the cells at once. So does charging to 100 percent and leaving the car sitting full for long spells. The gentle path is the opposite: charge at home on slower AC, keep the daily range between about 20 and 80 percent, and save fast charging for road trips. That is why the charging habit you choose above shifts the result. The cells themselves matter too, and the chemistry the big EV battery makers use is built to slow this fade.
Battery warranties
You are not left to absorb all of this risk. Most carmakers warranty the battery for 8 years or about 100,000 miles, and many promise the pack will still hold at least 70 percent of its capacity within that window. If it drops below that line during the warranty, they repair or replace it. That 70 percent floor is why this tool stops there. To plan around the numbers, pair this with the EV range calculator for everyday range, and browse the wider EV batteries guide for how packs are built and cared for.
Frequently asked questions
How much range will an EV battery lose in 8 years?
Most EVs lose roughly 2 percent of capacity per year, so after 8 years a battery is often around 80 to 85 percent of its original range. A car that does 250 miles when new would likely manage about 200 to 210 miles. Gentle home charging keeps it near the top of that range, while heavy fast charging and hot climates push it lower.
What damages an EV battery the most?
Heat is the biggest factor, followed by frequent DC fast charging and routinely charging to 100 percent and leaving the car full. Sitting at a very low state of charge for long periods also adds stress. Keeping the battery between about 20 and 80 percent for daily use and parking in the shade in hot weather all help it last longer.
Are EV batteries covered by warranty?
Yes. Most manufacturers warranty the battery for 8 years or about 100,000 miles, and many guarantee it will still hold at least 70 percent of its capacity within that window. If the battery drops below that threshold during the warranty period, the maker will repair or replace it.
Keep reading
How Long Do EV Batteries Last?
What real-world data says about EV battery lifespan, degradation rates and replacement.Read guide
The Biggest EV Battery Makers
Who builds the cells inside electric cars, and how their chemistry shapes durability.Read guide