What is the 80 20 rule for EV charging?

The 80/20 rule for electric vehicle charging refers to the recommendation to maintain the battery charge level between 20% and 80% to maximize battery lifespan. This principle is based on the chemical properties of lithium-ion batteries-prolonged full charge or deep discharge states accelerate battery aging. Currently, many electric vehicles and electronic devices support manually setting the charging limit to 80%, such as adjusting the charging threshold through the vehicle's system or mobile app. Some models even intelligently adapt charging patterns based on user habits. For daily use when long-distance driving isn't required, enabling this feature is recommended; charging can be temporarily set to 100% before long trips. This rule also applies to electronic devices like smartphones and laptops, serving as a universal strategy for protecting lithium-ion batteries.