How much battery is left in the phone is a critical question for many people. So what is the right way to charge your phone?
Does the phone have to be fully charged?
Regarding charging, there are always some sayings: the mobile phone is charged when it runs out of power, and it must be fully charged every time, so that it is conducive to battery maintenance, and charging at any time will affect the battery life.
In fact, these theories are rather outdated.
In the early years, rechargeable batteries, such as nickel-cadmium batteries, were mainly nickel hydroxide and cadmium metal, and the disadvantage was obvious: it had a memory effect.
To put it simply, when the battery is not exhausted or fully charged many times, the battery capacity will "remember" the amount of power when charging and when the power is off, and treat it as the maximum and minimum value of the battery, respectively, resulting in a decrease in battery capacity.
But now, nickel-cadmium batteries have been phased out due to heavy metal pollution, high weight, low energy density, etc., and have been replaced by lithium-ion batteries.
Compared with nickel-cadmium batteries, the advantages of smart phones are: high energy density, simply put, it stores more power under the same volume or weight, and the memory effect is weak, even if it is unplugged without being fully charged, it will not have any effect.
The precautions for lithium-ion batteries are just the opposite of those for nickel-cadmium batteries: do not recharge when you are out of power, do not overcharge, and do not need to charge and discharge deeply every time.
The lifespan of a lithium-ion battery is related to the charge cycle, and every time 100% of the battery is used, a cycle is achieved, and the more cycles are cycled, the more significant the battery life decreases.
Data from a study of 11 lithium-ions showed that after 250 cycles, the battery capacity was significantly attenuated.
After 300~500 cycles, the battery capacity will drop to 80% of the original capacity.
How does this work?
Some data show that when the lithium-ion battery is deeply charged and discharged, the material structure of the positive and negative electrodes will be destroyed. Lithium-ion batteries, on the other hand, rely on the movement of lithium ions between the positive and negative electrodes, and once there is less space to accommodate their activities, the battery capacity will be correspondingly lower.
Therefore, compared with "full charge and discharge", "multiple times and less charging" is more suitable for the charging habits of current mobile phones.
Plug in your phone or charger first?
Do you connect the plug to the power supply and then connect the phone with a data cable, or connect the data cable to the phone first and then plug the plug to the power supply?
The answer is: the former.
It's all charging, what is the impact of such a subtle difference?
Here is a knowledge point: the voltage of Chinese residents is 220V, but the voltage of mobile phone chargers is often within 5V, when charging mobile phones, the charger will convert high-voltage current through the transformer into low-voltage DC, and then send it to the mobile phone.
At this time, if the charger is plugged into the mobile phone and then plugged into the power supply, it can be regarded as directly connecting the mobile phone to the power supply, and the surge voltage may be output, while on the contrary, if the plug is plugged in first, it is already turned on, and the output has been stabilized at about 5V, so that there is less likely to be a surge voltage.
A surge, also known as a surge, refers to a transient overvoltage that exceeds the normal operating voltage. Sometimes the sparkle you see when you plug and unplug the switch is mostly a surge. Although the time is only one millionth of a second, it can cause a lot of damage to the battery of a mobile phone in the long run.
When you plug in the charger first and then connect your phone, this is almost impossible to happen. Unless the current itself is unstable.
After charging, should I unplug the phone or the plug first?
The answer is: unplug your phone first. Because at the moment of unplugging the charger, a reverse instantaneous current will also be generated, which accelerates the aging of the battery.
The principle may seem complicated, but it's not hard 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 "discarded", so that the operation is much safer.
The power bank is also affected
"Charge Cycle" effect
Many people will carry a power bank with them in case they can't find an outlet when they go out. It is indeed very convenient, a small power bank, can maintain the normal operation of the mobile phone, it is a savior.
But there are also many gimmicks and misunderstandings about power banks.
Currently, there are many power banks on the market that claim to be 20,000 mAh. But most mobile phones have a battery capacity of less than 5000 mAh. In the early years, the products were even only 2000~3000 mAh. After buying a 20,000 mAh power bank, wouldn't a family of three have to travel for two days without worrying?
When you actually buy it back, you find that you can't actually charge it that many times. In fact, the capacity marked by the merchant is mostly the capacity of the battery cell itself, that is, the sum of the power of multiple lithium-ion batteries in the battery.
If you want to know how many times the power bank can really be used, you have to carefully look at the small print in the manual: rated capacity. This is the smallest dischargeable capacity tested in the laboratory.
It should be noted that since the power bank is also a lithium-ion battery, the life of the battery is also affected by the charging cycle, and it is also recommended to "charge less many times" instead of "full charge".
How to charge it properly?
1. Can't mix charging cable and charger?
It is a common practice to buy a mobile phone and send supporting charging equipment, but in recent years, some manufacturers no longer give away chargers in the name of environmental protection, and can only buy them themselves. The price on the official website is too high, and I feel that the charging equipment itself is a consumable product, so many people will choose the cheaper one, which also leads to many people using it for a long time, maybe the charging cable, charger and mobile phone are not matching.
As a result, many rumors have come out: an unmatched charger will cause a short circuit in the battery and affect the service life.
In fact, this statement is obviously too underestimating the charger.
For example, if you buy a fast charger, but the phone does not support fast charging, then the fast charger will automatically adjust to the input power suitable for the mobile phone.
Some people complain that the fast charging head doesn't work, but that's actually the principle.
However, when buying, you should also try to identify the regular brand, don't be greedy to buy "copycat" products, after all, the configuration inside is really hard to say, it is likely to not identify the current and voltage required by the mobile phone, damage the mobile phone.
2. Don't charge while playing?
Some people will think that discharging and charging the battery at the same time will affect the lifespan, but in fact, what really affects the battery life is the sudden rise in temperature caused by charging while playing.
Everyone will have this experience, playing high-spec games, or using fast charging, the phone will get hot.
According to a survey, even when not using a mobile phone, the increase in temperature can still accelerate the reduction of battery capacity.
So, for the sake of battery safety, it's best not to let it "multitask".
In addition to this, it is important to note that you should not buy a case that is too thick for your phone.
There are many bells and whistles on the market right now, and they look good, but not every one of them is suitable for mobile phones.
Like computers and other equipment, mobile phones also need to dissipate heat, if it is wrapped tightly, and it is still used as a thermal insulation material, it will only make the mobile phone look like there are no scratches on the outside, and there is already damage on the inside.
Transferred from: People's Daily WeChat public account
Source: Popular Science China