Why does the last 1% of battery in a mobile phone last so long?

How would you feel when your phone only has 1% battery left? Most people are definitely surrounded by "insecurity", but this 1% of power can sometimes "last a long time" and even make people feel that it is more durable than 10%. Some netizens joked: The most durable things are the last bit of cosmetics left, and the phone with only 1% power left.

The battery life of a mobile phone is indeed unpredictable. In fact, sometimes even the mobile phone does not know how much power is left. What is going on? Today, the editor will take you to explore it together!

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Nowadays, most mobile phones will issue a low-battery warning when the battery is at 20% or 10%. If you are unable to charge or forget to charge at this time, you will find that the battery level of the phone will drop from 10% to 1% very quickly!

In fact, this 1% is not the real 1% of power left. At this time, the power of the mobile phone is often greater than 1%, and this 1% is probably just an estimate. Because most mobile phones are designed to reserve a portion of buffer power to tell you that you need to charge.

In addition, the remaining power of a mobile phone battery is actually difficult to estimate. Even the phone itself does not know the specific remaining power, which is also related to the characteristics of lithium-ion batteries.

Lithium-ion batteries are extremely susceptible to external environmental influences

Most smartphones on the market now use lithium-ion batteries. Due to the extremely active chemical properties of lithium, lithium-ion batteries are extremely susceptible to environmental influences, which makes them particularly demanding on the environment.

In daily applications, the most intuitive feeling is temperature! In winter, we will find that sometimes the phone has 30% battery left, but it automatically shuts down the next second! Even a new phone with a very durable battery will lose power outdoors in winter.

But there is good news: the impact of low temperatures in winter on mobile phones is generally temporary, and is intentionally designed in the mobile phone software to protect the battery life.

What you really need to be wary of with your phone is high temperature!

The higher the temperature, the faster the capacity of lithium-ion batteries will be lost, and this loss is irreversible. In other words, the capacity of the battery will be permanently reduced!

Another piece of bad news is that lithium-ion batteries have the phenomenon of self-discharge. If the phone is not turned on or the battery has not been used, the power will decrease by about 10% to 15% every month.

In addition, due to the slight differences in production processes of different manufacturers, models, and capacity batteries, each battery will also be different. Their aging degree and discharge curve determine that each battery is unique, even if they are the same model of mobile phone. Speaking of this, we have to mention the highlight of today, which is the battery management system.

Battery Management System, the Secret That Must Be Revealed

In order to maximize the function of each battery, battery engineers have developed a battery management system (BMS). Detecting the battery power is one of the important tasks of BMS.

The BMS system uses a chip to monitor the battery voltage in order to calculate the remaining battery power. This chip is called a fuel gauge, but the battery power cannot be accurately seen by voltage alone. In principle, the more power is discharged, the faster the voltage drops. For example, the voltage drops quickly when playing games, but the voltage drops slowly when reading novels. However, the voltage of lithium batteries during discharge is not linear, but a curve. In other words, this discharge process is constantly changing, and it is difficult to find out the rules. In addition, because mobile phones are so! Fun! Fun!

Social networking, entertainment, learning, online shopping, work... So many apps are crowded in the mobile phone, which makes the discharge state of the mobile phone very unstable. For example, the mobile phone discharges quickly when playing games or watching videos, and it discharges relatively slowly when chatting or shopping online. Therefore, there will be a certain error in detecting the remaining power of the battery through the BMS system, and the power display we see is just an estimate.

When you see that your phone has 1% battery left, it is likely that the phone has already gone through an "internal cycle".

Finally, I would like to remind you seriously that if the mobile phone battery is completely discharged, it will really affect its service life!

So everyone should pay attention to the timing of charging. Of course, if the phone consumes power very quickly during normal use, it means that you really need to replace the battery or choose to replace a new phone if conditions permit!