Reasons for slow charging of the mobile battery when the battery is close to full

All smartphone users notice that the battery charge becomes slower when the battery is near full, and this may raise users' questions, as the smartphone usually charges very quickly, starting from 0% charging to 80%, and the remaining percentage is complete Shipping takes a longer time.

The reason is due to the mechanism of action of lithium-ion batteries in general, and they are the batteries that are used in smartphones, portable personal computers, and even electric cars.

Battery charging slow: Lithium-ion batteries are charged in three successive stages, and these stages are mainly designed to protect the batteries from any dangers on the one hand, and on the other hand preserve their life.

The first stage is known as the pre-charge stage, or Pre-Charge, and during this stage, a current of 3 volts is released to the battery, and this low capacity works to revive the battery and prepare it to complete the charging process because the battery reaches a stage that is more like idle when it stays for a long time without charging.

This method also helps to revive the battery's protective shield, which is one of its main components. But the pre-charging process depends only on 10% of the charging capacity supported by both the phone and the charger. This explains why you need to leave the phone connected to the screen for a few minutes before you can turn it on if it has a 0% charge.

Charging stages: Upon completion of this stage, the second stage begins, which begins when the battery reaches a stable stage of 3 volts, and the second stage is known as the constant current, and the phone begins to fast charging gradually.

At this stage, the fast charging mode is activated in the phone, if available, and this stage continues to charge the phone at the highest possible speed until it reaches 80%.

After that, charging the battery enters its third stage, and this stage is also known as Constant Voltage. Overcharging, generally protecting the battery.

It is also known that charging a smartphone is measured in watts, which is the product of both voltage and current.

At this stage, the electric current continues to decrease continuously until the battery is fully charged, and in the last stages, the current is at its lowest levels, due to the effect of the stability of the voltage.

Until leaving the phone connected to the charger at this point it only receives 4 volts of power, the phone stays 100% full and once it drops to 99% this simple volt brings it back to 100%.


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