“Battery is low, 20% remaining.”
People who often hold their mobile phones in their hands are no strangers to this. Press the “Turn on low power mode” button and continue surfing the web. After all, 20% of the electricity can make the phone last for a long time…
Hurry up and charge your phone!
The low battery notification is not only a reminder to you, but also a call to your phone ! Almost all mobile phone manufacturers will list a similar reminder in the user guide: Don’t wait until the phone’s power is below 20% (or 10%) before charging.
Take a closer look at the guide provided by the manufacturer. It turns out that there are so many precautions for charging.
Too long to read the version
The most worry-free charging method: the mobile phone battery is kept at 20%-80%, and it can be charged at any time.
Avoid high (low) temperature when charging, remove the phone case when it is hot and avoid overuse of the phone.
Use original charger.
How many pits are there for charging?
Charging a mobile phone has always been a “technical activity”. From the earliest days when the mobile phone needed to be “recharged with automatic shutdown”, it will automatically stop charging when the power reaches 80%. A variety of charging techniques make it a little confusing.
In order to make everyone more anxious to understand the situation of mobile phones, manufacturers have gradually introduced the “battery health” function. This is good. Not only do you have to worry about the phone running out of power every day, but you also have to worry about the battery capacity being reduced. When charging, you have to worry about whether the charging method will damage the battery.
I don’t have time to worry about my health, but also the health of the battery丨Apple.com
We have sorted out the doubts that colleagues often encounter when charging, so that everyone can put aside “charging anxiety”.
Is it bad for the battery to recharge the phone when it is almost dead?
really not good.
Most mobile phones on the market now use lithium-ion batteries. If there is any “fatal injury” to this kind of battery, overcharging and discharging must be ranked first .
When a lithium-ion battery is in use, charging and discharging are completed by the movement of lithium ions between the positive and negative electrodes. During discharge, lithium ions escape from the negative electrode material and enter the positive electrode material, and the reverse is the case for charging. Although lithium ions run around, they will eventually combine with the positive and negative structures. When overdischarged, the stability of the negative electrode material will be destroyed. When overcharged, lithium ions are “deeply trapped” in the negative electrode material and cannot be released again. This structural change results in a reduction in the “capacity” of the battery, which cannot be reversed .
You don’t have to worry too much! Mobile phone manufacturers also take this into account and provide relevant protection mechanisms to avoid overcharging and overdischarging during design. While you don’t have to be afraid of extreme charging and discharging, to keep your battery in top shape, you still need to be careful: too low a state of charge can accelerate damage to your battery’s health .
Manufacturers will generally tell you in the charging manual: Don’t wait for the phone to run out of power before charging. Some of the standards for this near power outage are 10%, and some are 20%. In general, it is still necessary to charge in time, and try not to let the remaining power drop below 20%.
Samsung recommends not to let mobile phone battery be lower than 20%丨Reference 
Occasional low battery is not a big problem, just don’t “torture” the phone like this all the time.
Why can’t it continue to charge when it is charged to 80%?
It is the manufacturer who is “protecting” the cell phone battery.
Just like discharge, mobile phone manufacturers have also considered the problem of overcharging when designing. Even so, it ‘s not optimal for battery health to have a phone that is fully charged all the time . Therefore, many manufacturers use algorithm design to let mobile phones learn the daily charging habits of users. For example, if you are used to charging all night, the system will stop charging at about 80%, and calculate the time, and gradually fill it up before you get up.
Optimized charging in iPhone
What should I do if my phone is not fully charged when I want to use it in a hurry? You can turn off the option to “Optimize charging” in your phone’s battery settings.
In general, it is time to charge, but not too full .
Huawei’s official website recommends that the battery power be kept in the middle range丨Reference 
Can I play with my phone while charging?
Yes, but don’t hold your phone down.
Temperature is also one of the “adversaries” of mobile phone batteries. Lithium-ion batteries inherently heat up when they are charged. If you have been running large software at this time, the overall temperature of the phone is too high, which affects heat dissipation, which may cause damage to the active materials in the lithium-ion battery and affect the battery capacity.
Reference temperature range of lithium-ion batteries provided by Huawei’s official website丨References
At present, the operating temperature range of mainstream mobile phones is 0-35 degrees Celsius, which is also the temperature range suitable for lithium-ion batteries. When the temperature is too low or too high, the internal protection settings will slow down or even stop charging. If you still use the mobile phone to run large software while charging, it will even trigger the high temperature protection of the system. At this time, not only will the charging stop, but you will not even be able to continue using the mobile phone .
If there is no urgent matter, it is better to put the mobile phone to charge it early, and it can also save the range of the mobile phone from being limited by the charging cable.
There is no charging head, can I mix chargers?
Can. Just look for qualified products from regular merchants, but the charging speed may be slower.
Nowadays, mobile phone manufacturers have become accessories manufacturers. Not only do they not provide chargers when they buy mobile phones, but they also sell super expensive “original chargers”. What the official said in the documentation is also ambiguous: third-party chargers? Yes, but not recommended.
The fast charging function has become the main highlight of mobile phone manufacturers today, and the realization of the function is inseparable from the charging head that supports fast charging. Here comes the issue of compatibility. Different manufacturers use different fast charging protocols. If the user uses a fast charging head that does not support the same protocol, the result is “slow charging” .
Of course, you don’t have to worry about charging your iPhone with an iPad charger, because the battery management chip in the phone regulates the input voltage and current. For details, you can read this article: “Is it possible to use an iPad charger to charge an iPhone? 》
From the point of view of saving trouble, it is most convenient to buy the official configuration directly. It is not impossible to use a third party, as long as you look for a regular manufacturer . If you want to experience the fast charging function of your mobile phone, you can ask if the merchant supports the relevant protocols of a specific mobile phone model.
Can I use the computer USB port to charge my phone?
Yes, but the point is to be slow.
USB ports are designed with power for external devices in mind, but not for charging. Therefore, the traditional USB port output on the computer is only 5V and 100mA, which is smaller than the iPhone’s ancestral 5V and 1A.
If you forgot to bring a charging head and only have a computer and a cable, you can also look at the signs next to the different USB ports. Some computers will have a USB port marked with a lightning bolt . This port can continue to provide power when the computer is turned off. Although it is a bit slow, it is not impossible to treat the notebook as a large charger.
The logo of the USB is different, representing additional functions丨Dell.com
Finally, it’s time to call out “the mobile phone is a tool, don’t bother so much”. But considering my own wallet, some “pits” that can be avoided easily can still be avoided.
In short, I wish everyone good health and a healthy battery!
 Samsung phones: 11 tips to extend and improve your Samsung Galaxy battery life
 How to extend battery life and battery maintenance for Huawei mobile phones/tablets. https://ift.tt/upDlZjT
 Huawei: Introduction to battery performance and applications. https://ift.tt/EOvZKnU
 Huawei: Can I use a non-standard charger or data cable to charge my phone? https://ift.tt/51D69tf
 iPhone Battery and Performance. https://ift.tt/7yv0qPI
 vivo battery. https://ift.tt/THmxbs3
OPPO Battery Life: Tips on How to Make It Last All Day. https://ift.tt/IaZwpKO
realme: Can I use a non-standard charger or data cable to charge my phone?https://ift.tt/EWtLGz3
 One plus mobile phone: slow charging of mobile phone / no fast charging. https://ift.tt/BXZSq3C
 Xiaomi Phone: The Correct Way to Charge Your Phone or Tablet. https://ift.tt/ke1BEA8
Here’s the truth behind the biggest (and dumbest) battery myths. https://ift.tt/yrpWzwq
Loveridge, MJ, Tan, CC, Maddar, FM, Remy, G., Abbott, M., Dixon, S., … & Greenwood, D. (2019). Temperature considerations for charging li-ion batteries: Inductive versus mains charging modes for portable electronic devices. ACS Energy Letters, 4(5), 1086-1091.
Edit: Window knocks rain
Taking a peek at the author’s mobile phone, I know why he wrote this article:
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