The danger of charging the mobile phone battery overnight

In the past few years, mobile phone battery technology has undergone several major changes. Therefore, some of the tips used in previous batteries have not been fully applicable under the new technical conditions, but many people still believe this. Before some people who don't know the truth spread the wrong battery knowledge to others, it is necessary to clarify some common cell phone battery misunderstandings.

Myth 1: You must drain the battery to charge

Once, the batteries were more "forgetful", always forgetting what their total capacity is, and they can no longer be full. So you have to completely drain the battery before you start charging, in order to minimize the loss of battery capacity. But this set of guidelines is completely inapplicable on today's batteries.

Nowadays, the mobile phones are all equipped with lithium batteries, and there is no longer any problem with battery memory. In other words, you can charge anytime, anywhere, without worrying about the loss of battery capacity. The following quotes Apple's official description of lithium batteries, this rule also applies to all lithium batteries.

At any time, you can charge your lithium battery without waiting for the battery to run out. Apple's lithium battery uses a charging cycle: When you use the same amount of battery capacity (not necessarily used up after a single charge), you complete a power cycle. For example, you consumed 75% of the total battery capacity the previous day, then filled the battery at night, and used 25% the next day, at which point you completed a complete power cycle. After several cycles of power consumption, the capacity of any battery will drop to varying degrees. In the case of lithium batteries, this drop is very slight. At the beginning of Apple's lithium battery design, after a large number of power cycles, the battery capacity can still be maintained at more than 80% of the original capacity, depending on the product.

Most manufacturers will advise you to perform a battery "correction" every 1-3 months. In theory, each power cycle will shorten the battery life, completely exhausted and then fully charged to help the system accurately determine the remaining battery capacity. However, more and more batteries have built-in digital calibration tools. These “smart batteries” can automatically calibrate the battery for you, but when you find that the battery is not performing properly, it is a good choice to use the traditional method of calibration, but it is not recommended to do so often. The exhaustion of the power is completely harmful to the lithium battery, and ultimately it is not worth the loss.

Myth 2: Charging overnight will shorten battery life

Just as the battery is exhausted before it can be charged, the battery cannot be overcharged and it is a widely circulated knowledge. In the past, lithium batteries overheated and even exploded during long-term charging, which affected the battery life.

Today, smart phones and chargers are well placed to handle battery overheating. The following reasons are the words of Andrew Goldberg, the master of the well-known disassemble website iFixit technology:

Overcharging doesn't matter. Contrary to what you think, connecting your phone or computer to the charging cable for a long time is not harmful to the battery. Because both the charger and the device, they are smart enough. Long-term trickle charging is much less damage to the battery than over-discharge.

In other words, this practice can cause damage to the battery, but it is almost negligible. In fact, keeping the power at 40%-80% is most conducive to battery maintenance, but it is easier said than done. All in all, what you have to remember is that charging the battery all night does not damage the battery.

At the same time, I would like to point out that the way to maintain the battery of the smart phone is different from the way to maintain the battery such as the notebook. The reason is very simple: now people change the frequency of the mobile phone more and more, during the service period, the battery will not be too obvious. The attenuation, so at this point, don't have to be too tangled.

Myth 3: Turn off the background app to improve battery life

We often think of a smart phone as a tiny computer, which is functionally true. In a notebook, if you open a lot of software, especially in the case of networking, the power of the notebook will quickly run out. Naturally, you will move this thinking to your mobile phone, and so is it on your mobile phone? Not also.

Take the iOS system as an example. The way the application is opened is different from the way the software is opened on the notebook. The app does not reside in the background. After exiting the app, the app is frozen and does not consume any resources. Former Apple Genius Technician Scotty Loveless explained the following:

After exiting the app, the entire application is released from RAM. When the application is opened again, the RAM is reloaded. This repeated login and logout operation is not a smart choice. And the excellent background control mechanism of the iOS system can automatically exit the application if a large amount of memory is needed, that is, the system has done these things for you. The user should be the owner of the device, not a slave.

In fact, on Android, this set of rules still applies. There are a lot of background management applications on the Android platform, which claims to automatically manage applications and extend battery life. However, these applications have no use or even more power. Instead of wasting time logging in and logging out of the app, it's better to turn off background data synchronization. If it is not turned off, the application can call the background data without being opened, which will use a part of the CPU and consume power.

The above talked about so much, not that the application has no effect on battery life. Some applications, especially messaging applications such as WeChat, are a test of power, and should be turned off when not needed. Unused APPs are uninstalled in time. Some applications come with "original sin", which is unreasonable when programming, and consumes a lot of power.

Myth 4: The official charger is the only choice

Mobile phone manufacturers hope that you can use the charger that comes with your mobile phone. In fact, as long as you don't use inferior, counterfeit products, you can use other chargers.

Now the USB charging interface has been basically unified, although the charging time is different for different chargers, but this has no effect on the battery. The battery of the smartphone is now smart enough to handle different types of chargers. As long as the charger can provide a stable current, there is no such problem as battery overheating.

Myth 5: Turn off Bluetooth, Wifi, and positioning to save a lot of power

Every new feature added to a smart phone seems to be a devastating battery, such as Siri and Google Now, but there is no need to turn off all new features in order to save power, especially some basic system features such as Bluetooth and wireless network.

Someone has experimented on the iPhone to see how much better the endurance of applications that turn off these systems. The results show that the open location service has almost no impact on battery life; in flight mode, all wireless connections are turned off, and eventually only 30 minutes of battery life is not worth it.

At one time, Bluetooth, wireless networks, etc. were indeed big consumers, but now there have been great improvements. In the case of a location service, the location service is called only if the application requires it, and is otherwise turned off.

In fact, the real power consumer is the screen. If you really care about battery life, please turn off the screen and put your phone back in your pocket.

The page contains the contents of the machine translation.