Charging Electric Cars to 100 Percent: Why It's Not the Golden Rule

When it comes to maximizing the lifespan and efficiency of an electric car's battery, the key lies in striking a balance. Just like Goldilocks found the perfect porridge temperature, electric car owners must keep their State of Charge (SOC) in the optimal “Goldilocks zone,” not too high or too low, but just right.

Why Not Charge to 100 Percent?

While some situations might demand that you charge your electric car to 100 percent, it's generally not recommended to leave it at this level for extended periods. This is because battery charging rates significantly taper off as you approach 100 percent. For example, if you're on a long trip and need to charge to 100 to reach a charger, it might be better to plug in just to 80 percent and recharge at the next station.

The Optimal Charging Zone

Research and data from experts like Richard Petek show that prolonging the battery's life is closely linked to staying within the optimal SOC range. A illustrates this correlation, indicating that staying close to the top/orange line provides the highest capacity retention over charge cycles and battery age.

For daily commutes, maintaining a range between 50 and 75 percent SOC is quite effective. Once you reach home, plug it in immediately. This practice helps prevent deep discharge, which can be harmful to battery health. In long trips, aim to charge to about 80 percent and recharge sooner rather than later.

Understanding Tapering Rates

The tapering rate of battery charging is a natural phenomenon, not a deliberate strategy to protect the battery. As the battery fills up, it begins to resist accepting large amounts of power. This is why the question 'how long does it take to fully charge your EV' is often irrelevant. Instead, focus on recharging to a higher level when you have the opportunity.

To optimize your trip, consider using tools like A Better Routeplanner, which can determine the ideal charging stops for you based on time and distance.

Conclusion

Understanding and implementing the right charging habits for your electric car can significantly enhance its performance and longevity. By keeping your SOC within the Goldilocks zone, you'll ensure your battery remains in top condition, ready for your next journey.

Explore More

For more insights on transportation and electric vehicles, explore my YouTube channel: Origami Cybertruck.