How does fast charging affect battery life?

Battery chemistry and influence of charge type

Modern electric cars use lithium-ion batteries. These batteries are capable of both fast charging (DC) and slow normal charging (AC), but there are differences:

• Fast charging raises the battery temperature and increases the chemical stress on the cells, especially if the car is often charged at high power and in hot climates.
• Normal charging is generally gentler, with lower heat development and slower chemical aging.

Research results and practical insights

Recent studies show that modern BMS (Battery Management Systems) effectively protect the battery during fast charging. Long-term data from Geotab indicates an average capacity loss of about 1.8% per year in modern electric cars.

Tips for Balancing Speed and Durability

• Use fast charging when needed (travel, tight schedule), but please alternate with normal charging for everyday use.
• Never carry out full discharge or constant fast charging — it is better to charge between 20 — 80% for minimum wear.
• Charge preferably in neutral temperatures and avoid very high or low outside temperatures when walking.

Common myths and what the research says

The claim that “fast charging destroys the battery” is a myth with today's technology — but excessive frequency and high temperatures can have an impact in the long run. The development of ever better BMS (Battery Management Systems) has made fast charging considerably more gentle than just a few years ago.

Summary:

Fast charging in itself is not harmful to pre-modern electric car batteries, but for maximum life, a balanced charging strategy is best: use fast charging when needed and normal charging in everyday life.

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