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When charging your phone, you should first plug the charger into the power source before connecting the phone

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.03.14
When charging a mobile phone, should the charger be connected to the phone first or plugged in  power source first?


The correct answer is to first connect the charger plug to the power source, and then connect the data cable to the phone.

What is the impact of the order in which the charger is connected to the power source and the phone on the battery？

Here we need to introduce a knowledge point: the voltage of electricity used by Chinese residents is 220V, but the voltage of mobile phone chargers is often within 5V. When charging mobile phones, the charger will convert the high-voltage current through a transformer into low-voltage DC and then transmit it to the phone.

At this point, if the charger is connected to the phone and then plugged into the power supply, it can be considered as directly connecting the phone to the power supply, which may output surge voltage; On the other hand, by inserting the plug first, it is already in a connected state and the output has stabilized at around 5V, so there is less possibility of surge voltage.

Surge, also known as surge, refers to the instantaneous overvoltage that exceeds the normal operating voltage. Sometimes the flashing sparks you see when you plug and unplug the switch are mostly surges. Although the time is only one millionth of a second, it can cause significant damage to the phone battery over time. When the charger is plugged in first and then connected to the phone, this situation is almost unlikely to occur. Unless the current itself is unstable.

After charging, should I unplug my phone or unplug the power first?


The answer is: unplug the phone first. Because at the moment of unplugging the charger, reverse instantaneous current will also be generated, accelerating the aging of the battery.

The principle may seem quite complex, but it's not difficult to remember the correct insertion and removal order. You can try to integrate the charger, charging cable, and socket. When charging, it means the phone is "stuck", and when fully charged, it means the phone is "abandoned". This way of operation is much safer.
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