What is the 80% rule for EV charging?

The 80/20 EV Charging Rule: EV Battery Charging Best Practices

1. Charging Efficiency: The 80/20 rule takes into account the charging characteristics of lithium-ion batteries. Charging up to 80% allows for efficient and fast EV charging, as charging rates slow down significantly beyond this point.

2. Reduced Heat Generation: Charging a battery to its full capacity generates more heat, which can contribute to accelerated degradation. By stopping at 80%, the heat generated during charging is minimized, promoting better long-term battery health.

3. Chemical Stress: Lithium-ion batteries undergo chemical stress during charging and discharging cycles. Avoiding extreme states, such as a full charge or deep discharge, helps mitigate this stress, resulting in slower capacity loss and extended battery life.

4. Buffer for Unforeseen Events: Operating an EV within the 80% charging range provides a buffer for unexpected events, allowing for a reliable power reserve. This ensures optimal performance during unforeseen trips or diversions without compromising overall battery health.

5. Efficient Energy Utilization: Lithium-ion batteries exhibit higher charging efficiency at lower and mid-range charge levels. Adhering to the 80/20 rule taps into this efficiency, optimizing energy utilization and potentially saving on charging costs.

6. Battery Health Monitoring: Consistently following the 80/20 rule provides valuable insights into the battery's health. Regular monitoring and maintenance of charging levels allow for early detection of any unusual behavior or potential issues, facilitating timely intervention and support from the manufacturer.

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