Why does the battery charge so slowly when it is almost full?
Why does the battery charge so slowly when it is almost full?

All smartphone users will find that the battery charging speed slows down when the battery is almost full. This can cause problems for users.

Usually, the charging speed of a smartphone is very fast, from 0% to 80%. As for the remaining percentage to complete charging, it will take longer time.

The reason for this is the mechanism of action of general lithium-ion batteries. These batteries are used in smartphones, laptops, and even electric cars.

Battery charging is slow

Lithium-ion batteries are charged in three successive stages. These steps are mainly aimed at protecting the battery from hazards on the one hand and maintaining its service life on the other.

The first stage is called the pre-charging or pre-charging phase. At this point, a current of 3 V is discharged to the battery. This lower capacity refreshes the battery and prepares it for the end of the charging process. This is because the battery will go into sleep mode if it is not charged for a long time.

This method makes it possible to restore the protective cover of the battery, which is one of its main components. However, the pre-charging process is only dependent on 10% of the charging capacity supported by the phone and charger. This explains why you need to leave your phone connected to the screen for a few minutes when your phone battery is at 0% to turn it on.

Charging stages

After completing this stage, the second stage begins. It starts exactly when the battery steadily reaches the 3 volt level. The second stage is called direct current. Then the phone started charging quickly.

At this point, the phone is in fast charging mode (if available). At this point, the phone will continue to charge as fast as it can until the battery level reaches 80%.

After that, the battery charge enters the third stage. This step is also called continuous pressing. At this point, the mobile is receiving a constant voltage, which is why the effect is slower at this point. However, the purpose of this technology is to prevent the phone from overcharging and to protect the battery.

As we all know, the charging unit for smartphones is watts. It is the product of voltage and current.

In this step, the current continues to decrease until the battery is fully charged, and in the last step the current is at the lowest level due to the voltage stabilizing effect.

At this point, the mobile phone connected to the charger can only receive 4V power. The phone stays 100% full, and once it drops to 99%, this simple effort will bring it back to 100%.

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