When the battery is too low, when the battery is less than 5%, the battery will have an exclamation point and turn red. You should charge it in time at this time.

There are power-consuming programs in the background, and the mobile phone monitors these programs to run in the background. You can view the display by dropping down the notification bar, or you can clear it with one key.

Extended reading:

Battery charging method:

1, mobile phone battery consists of three parts: battery core, protection circuit and shell. At present, all mobile phone batteries are lithium-ion batteries (often referred to as lithium batteries in irregular situations), and the cathode material is lithium cobalt oxide. The standard discharge voltage is 3.7V, the charging cut-off voltage is 4.2V, the discharge cut-off voltage is 2.75V, and the unit of electricity is Wh (watt-hour). Because the standard discharge voltage of mobile phone battery is 3.7V, it can also be replaced by mAh (milliampere hour). The conversion relationship between these two types of units on the mobile phone battery is: watt-hours = ampere-hours ×3.7.

2. Overcharge, overdischarge and short circuit will seriously damage the performance of the battery and may lead to use risks. For this reason, there is generally a slender protective circuit board in the battery of mobile phones to prevent these risks.

3. Chargers are divided into direct charging and seat charging. Direct charging converts 220 AC commercial power into 5V DC power supply, which is input to the mobile phone, and the voltage is reduced by the charging circuit of the mobile phone for battery use. Generally, there will be delivery when you buy a mobile phone. The charger is directly connected to the battery and converts the mains electricity into the voltage required by the battery.

4. If you want to use the seat charger, please try to choose original or excellent quality products. If the charging circuit in the seat charger is of poor quality, there will be charging risk.

5. Lithium ion batteries have no memory effect, but they are inert. If it is not used for a long time, it may be passivated. After many times of charging and discharging, the best performance can be restored.

6. Before charging, the lithium battery does not need special discharge. Some fast chargers only show 90% full when the signal light changes, and the charger will automatically change to charge the battery slowly. But generally speaking, as long as it is full, it can be removed.

7. In order not to damage the battery life, it is best to charge slowly; It won't take long.

8. There is self-discharge in the mobile phone battery, because excessive discharge will damage the battery. If you don't use the mobile phone battery for a long time, make sure the battery has a certain amount of electricity.

9. Although our mobile phone is within the coverage of the network, our mobile phone can't answer calls after it is turned off and charged. At this point, we can use the disconnection transfer function of the mobile phone to transfer the mobile phone to the fixed telephone around us to prevent the incoming call from being lost. This method is also applicable when the mobile phone is not in the network coverage area or the signal is weak and temporarily unable to connect.

10, don't expose the battery to high temperature or cold, like dog days, and don't expose the mobile phone in the car; Or take it to an air-conditioned room and put it in a place where the cold wind blows directly. When charging, it is normal for the battery to be a little hot, but it cannot withstand the "suffering" of high temperature. In order to avoid this situation, it is best to charge at room temperature and don't cover anything on the mobile phone.

1 1. When charging, the longer the better. When the inferior battery without protection circuit is fully charged, stop charging. If it is not used for a long time, the battery should be separated from the mobile phone.

12, the newly bought battery does not need to be charged for the first time 12 hours, but it is best to fully charge and discharge for 3~5 hours. Fully charged refers to normal charging to 100%, and fully charged refers to when the mobile phone uses a low battery reminder. Because the battery has to go through electrolyte filling, formation, charging and discharging, capacity separation and other processes. The battery is activated before leaving the factory, but it will take at least one month to reach the user after leaving the factory. Due to the influence of battery self-discharge, the battery material is passivated. At this time, the battery can be activated by fully charging and discharging.

In the use of lithium batteries, it should be noted that after a period of time, the battery will enter a dormant state, when the capacity is lower than normal, and the use time will be shortened. However, the lithium battery is easy to activate, and it can be activated after 3-5 cycles of normal charge and discharge, and the normal capacity can be restored. Because of the characteristics of lithium battery itself, it has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not need special methods and equipment in the activation process. Not only in theory, but also from my own practice, it is best to charge this "natural activation" way in a standard way from the beginning.