When charging, plug in the mobile phone or the charger first? These wrong charging methods make the mobile phone break fast!

How much battery is left on the phone is a matter of "life and death" for many people in modern society.
People's strong demand for mobile phone charging has also spawned many gimmicks on the market: wireless charging, double-speed charging, and high-energy power banks that can be used continuously for a week.

 

 

Chaotic flowers are gradually fascinating, but what is the correct posture for charging a mobile phone?

Regarding charging, there are always some sayings: the mobile phone is out of booster charge, and it must be fully charged every time, which is conducive to battery maintenance, and charging at any time will affect battery life.
In fact, these theories are relatively outdated.
The rechargeable batteries widely used in the early years, such as nickel-cadmium batteries, are mainly raw materials of nickel hydroxide and metal cadmium, and the disadvantage is obvious: there is a memory effect.
Simply put, when the power is not exhausted or fully charged many times, the battery capacity will "remember" the power at the time of charging and power failure, and regard it as the maximum and minimum power respectively, resulting in a reduction in battery capacity.
But now, nickel-cadmium batteries and other reasons have been gradually eliminated due to heavy metal pollution, high weight, and low energy density, replaced by lithium-ion batteries.

 

 

Smartphones use mostly lithium-ion batteries. Compared with nickel-cadmium batteries, its advantages are: high energy density. In short, it stores more electricity under the same volume or weight; the memory effect is weak, even if it is not fully charged. Unplug it and it will have no effect.
The precautions for lithium-ion batteries are just the opposite of cadmium-nickel batteries: do not recharge when there is no power, and do not overcharge, and do not need to be deeply charged and discharged every time.
The life of a lithium-ion battery is related to the charging cycle. Whenever the power is used up to 100%, a cycle is realized. The more cycles, the more obvious the decline in battery life.

Data from a study of 11 lithium ions showed that after 250 cycles, the battery capacity decayed significantly.
After 300 to 500 cycles, the battery capacity will drop to 80% of the original.
How does this work?

Some data show that when lithium-ion batteries are deeply charged and discharged, the material structure of the positive and negative electrodes will be damaged. Lithium-ion batteries mainly rely on the movement of lithium ions between the positive and negative electrodes to work. Once the space to accommodate them becomes less, the battery capacity will become correspondingly lower.
Therefore, compared with "full charge", "multiple times less charge" is more suitable for the charging habits of current mobile phones.
In addition to the power before and after charging, another problem that is easily overlooked by people also affects the service life of the battery.

Do you want to connect the plug to the power supply first, and then connect it to the mobile phone with the data cable, or connect the data cable to the mobile phone first, and then connect the plug to the power supply?
The answer is: the former.

 

 

It's all charging, what effect does such a subtle difference have?
Here is 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 the mobile phone, the charger will convert the high-voltage current into low-voltage DC through the transformer, and then send it to the mobile phone.
At this time, if the charger is connected to the mobile phone and then plugged into the power supply, the charger may lose its self-adjustment ability, thereby outputting the surge voltage.
Surge, also known as surge, refers to an instantaneous overvoltage that exceeds the normal operating voltage. Sometimes the 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 a lot of damage to the phone battery in the long run.
When plugging in the charger first and then connecting the phone, this situation hardly happens. Unless the current itself is unstable.

After charging, do you want to unplug the phone first or unplug it first?
The answer is: unplug the phone first. Because the moment the charger is unplugged, a reverse instantaneous current will also be generated, accelerating the aging of the battery.
The principle seems complicated, but it is not difficult to remember the correct order of plugging and unplugging. You can try to treat the charger, charging cable and socket as one. When charging, the phone is "pasted over", and when it is full, the phone is "abandoned". This way, the operation is much safer.

Many people will carry a power bank with them in case they can't find an socket when they go out. It is indeed very convenient, and a small mobile power supply can keep the normal operation of the mobile phone, which is a savior.
But there are also many gimmicks and misunderstandings about power banks.
At present, there are many power banks claiming to be 20,000 mAh on the market.
You know, most mobile phones, even the flagship version, have a battery capacity of less than 5000mAh. In the early years of "nail household" products, even only a pitiful 2000-3000mAh. Bought a 20,000 mAh power bank, wouldn't it be a family of three that doesn't have to worry about traveling for two days?

When you really buy it back, you will know that it will be out of power if it cannot be charged twice. Could it be that the merchants are false propaganda? In fact, they are playing a word game.
The capacity marked by the merchant is mostly the capacity of the battery itself, that is, the sum of the power of multiple lithium-ion batteries in the battery. Since the power will be lost during the conversion process, the effective power that the power bank can provide to the mobile phone must be lower than this data.
If you want to know how many times the power bank can really be used, you have to carefully read the small print in the manual: rated capacity. This is the minimum discharge capacity tested in the laboratory.
Some media have done an evaluation. For those power banks that claim to be 20,000 mAh, the actual capacity of the largest and smallest can be as poor as 4000 mAh, which is enough for most mobile phones to be fully charged once.
When using the power bank, you should also pay attention: because the power bank adopts the same lithium-ion battery, the life is also affected by the charging cycle, it is best not to charge the power bank for a long time.

If the use of mobile phones also has a short board effect, the power is probably the short board. However, in daily use, there are also some charging methods that you think are correct, but they are not.
1. Can't mix charging cable and charger?

It is customary to buy a mobile phone and give away matching charging equipment, but in recent years, some manufacturers no longer give chargers in the name of environmental protection, so they can only buy them themselves. The price on the official website is too high, and many people will choose cheaper ones, thinking that the charging equipment itself is a consumable product. Once you don't stare at the cat at home, the charging cable will be bitten and unusable. This also leads to many people not using it for long, maybe the charging cable, charger and mobile phone are not matched.
As a result, many rumors have come out: unmatched chargers will cause short circuits in the battery and affect the service life.
In fact, this statement is obviously too underestimating the charger.
The charger is generally equipped with a smart chip inside to identify the current and voltage required by the mobile phone and adjust it. For example, if you buy a fast charging head, but the mobile phone does not support fast charging, the fast charging head will automatically adjust to suit the mobile phone. Input power.
Some people complain that the fast charging head does not work, which is actually the principle.
However, when purchasing, you should also try to look for regular brands, and don't buy counterfeit products cheaply. After all, the configuration of counterfeit products chargers is really hard to say, and it is likely that the current and voltage required by the mobile phone will not be recognized, which will damage the mobile phone.
2. Don't charge while playing?
Some people will think that letting the battery discharge and charge at the same time will affect the life. In fact, what really affects the life of the battery is the sudden rise in temperature caused by charging while playing.
Everyone will have this experience, playing high-profile games, or using fast charging, the phone will get hot.
A survey shows that even without a mobile phone, rising temperatures will still accelerate battery capacity reduction.
Therefore, for the sake of battery safety, it is best not to let it "multitask".
In addition, it should be noted that do not buy too thick protective case for the phone.
There are many fancy protective cases on the market now, which are good-looking and good-looking, but not every one is suitable for mobile phones.
Like computers and other equipment, mobile phones also need to dissipate heat. If it is tightly wrapped and insulated, it will only make the phone look like there are no scratches on the outside, and the inside has long been damaged.
In order to avoid the high temperature, be careful not to put your phone next to your pillow and in the sun before going to bed. This move protects not only the phone, but you.