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Does Charging to 100% Damage the Battery?

Published in Battery Health 2 mins read

While charging your battery to 100% won't cause immediate, noticeable damage, it can contribute to battery degradation over time.

Long-Term Effects of 100% Charging

It's true that short-term charging to 100% won't cause immediate issues. However, according to the provided reference, maintaining a charge level between 20-80% can significantly prolong the overall lifespan of your battery. The reference states:

It is true that if you charge your battery to 100%, you won't notice any degradation for quite a while. But, over a longer period of time you will have a longer, and more sustainable battery life if you try to keep it between 20-80% as much as you can. I wouldn't stress too hard about it.03-Dec-2023

This implies that routinely charging to 100% places additional stress on the battery's internal components which can lead to faster degradation of the battery over extended periods.

Why 20-80% is Optimal

Keeping the battery within this range reduces stress and strain on the battery, preventing degradation.

Here are some points to consider:

  • Avoid extremes: Both very low and very high charge levels can degrade the battery.
  • Cycle count: Batteries have a limited number of charge cycles. Each full charge counts as one cycle, so avoiding 100% charges can reduce the rate at which those cycles are used.
  • Heat: Charging to 100% may generate slightly more heat, which can be detrimental to battery health.

Practical Tips

To maximize your battery’s lifespan:

  1. Avoid fully charging whenever possible, aiming for the 80% mark.
  2. Don't let your battery drain completely; recharge it before it hits 20%.
  3. Avoid extreme temperatures when charging or discharging.

While you don’t need to be overly concerned about every single charge, following these practices can help in the long run.