How fast do EV batteries degrade?
Most modern EV batteries degrade at approximately 1.5-2.3% per year under normal use. After 8 years, a battery degrading at 2% per year retains approximately 85% of its original capacity. Older chemistry batteries like the Nissan Leaf's degrade faster. Modern lithium iron phosphate batteries used by some manufacturers degrade particularly slowly.
What is covered by the EV battery warranty?
Most EV manufacturers warrant the battery for 8 years or 100,000 miles, whichever comes first, guaranteeing it will retain at least 70% of its original capacity. If your battery degrades below 70% within the warranty period, the manufacturer must repair or replace it.
How can I slow EV battery degradation?
The most effective steps are to avoid regularly charging above 80-90% unless you need maximum range, reduce frequent use of ultra-rapid DC charging for daily driving, avoid leaving the battery at very low charge for extended periods, and park in shade during extreme heat.