The Danger of Deep Discharge: Why is it Harmful to an Electric Vehicle Battery?

The battery is the most expensive and important part of an electric car. And although modern technologies make them more reliable, owners of electric cars should know one important rule: you should not allow the battery to completely discharge. This will not only lead to inconvenience on the road, but can also cause serious and irreversible damage to the battery. You can improve your car and make it look unique thanks to tuning , accessories for which are available in a large assortment in our online store.

Impact on chemical composition

Batteries in electric vehicles are typically lithium-ion batteries, which work by moving lithium ions between electrodes.

• Structural destruction. Deep discharge below 20% or even to 0% can damage the chemical structure of the battery.
• Loss of capacity. With each full discharge, the battery loses some of its maximum capacity.

Reduced service life

Battery life is measured in charge/discharge cycles. However, a full discharge significantly accelerates battery degradation.

• Reduced cycle count: Regular deep discharge reduces the total number of cycles a battery can withstand, leading to rapid wear and tear.
• Increased internal resistance. Over time, the internal resistance of a battery increases, which reduces its performance.

Failure risk and security

A full discharge carries not only risks to durability, but also to safety.

• "Deep sleep." In some cases, when the battery is completely discharged, it can enter a so-called "deep sleep" from which it is difficult, and sometimes impossible, to wake up.
• Systems failure. The electric vehicle will not be able to function even to ensure the operation of basic systems, which will create an emergency situation.
• The vehicle may lock up. Some models may automatically lock the systems to prevent further discharge, which may cause inconvenience to the driver.

Conclusion

To prolong battery life and ensure reliable operation, it is recommended to maintain the battery charge level between 20% and 80%. A full discharge is an emergency situation that should be avoided.