Should the phone be charged overnight?

A lot of conflicting opinions about plugging in the phone charger overnight, the speaker said yes or no. So where is the truth?

The truth about charging the phone overnight

A very brief question but there are many answers appearing on the vast Internet world.

Expert judgment

There have been explanations from experts who study the Li-ion batteries based on the theory of physical and chemical properties of Lithium-ion batteries. Accordingly, lithium ion batteries are very sensitive to large changes in state and temperature, overnight charging will make the phone charge always maintain a small charge to fill every time the battery drops%.

This small charger will change the charging / discharging status of the battery continuously during the night of charging. That's why the phone battery is quickly reduced in capacity.

But what about reality?

In fact, the phone manufacturing industry has developed over many years, Li-ion battery technology has existed for decades, so manufacturers understand how to make the products they make. does not become a scrap just because the user does not know how to use it.

Image of power management chip on iPhone 5.

Each device uses a Li-ion battery today, in addition to a battery storage unit, it is an equally important part of the power management chip . This chip will act as a CPU in a normal PC, it will actively regulate, distribute, and shut off the charger to the battery depending on the circumstances needed.

On the theory of Li-ion battery charging that we hear a lot, the phone charger will provide a current of about 1.5 to 2A and 5V voltage for the phone to fully charge the battery, when the battery is full, electricity The voltage on the battery increases gradually, causing the input current to gradually descend to 0 Amperes to maintain the battery at 100%.

The theoretical graph shows the variation of electric current and voltage when charging the Lithium-ion battery.

In fact, when the battery is charged to 0%, the power management chip will completely close the charging line and not maintain a micro current. On the other hand, in order to maintain 100% battery life, the power management chip will switch the device to power use mode directly from the wall charger, not through the battery.

Now the battery on the phone is like being pulled out of the device and there is no electricity consumption from the smartphone. In fact, it is true that Li-ion batteries will consume electricity themselves even when not in use, but this reduction is about 5% within . 1 month . Therefore, plugging in the phone overnight will not cause continuous charging / discharging to reduce battery life.

Conclude

Charging your phone overnight will not be a problem.

So the conclusion is that if you have plugged in the charger 24/7 continuously for 1 year , your phone battery will be affected a bit , but the overnight charger is almost not causing the reduction of life expectancy as well as capacitance The amount of smart phones today.