[Discussion] What does the exclamation point on the battery logo mean? 【to have】

There are two reasons for the battery exclamation point:

The battery power is too low. When the mobile phone battery is below 5%, an exclamation mark will appear on the screen. battery and turns red. At that time, it should be loaded in time.

There are power-consuming programs running in the background. The phone monitors these programs running in the background. Pull down the notification bar to see the display, or you can clean them with one click and they will disappear. .

In-depth reading:

Battery charging method:

1. Cell phone batteries are made up of three parts: the battery core, the protection circuit, and the case. Currently, mobile phone batteries are all lithium-ion batteries (often called lithium batteries in non-standard situations), and the cathode material is lithium oxideand cobalt. The standard discharge voltage is 3.7 V, the charging cut-off voltage is 4.2 V, and the discharge cut-off voltage is 2.75 V. The unit of power is Wh (watt hour). Since the standard discharge voltage of cell phone batteries is uniformly 3.7 V, mAh (milliamp hour) can also be used instead. The conversion relationship between these two types of units on cell phone batteries is: Watt-hour = Ampere-hour × 3.7.

2. Overcharging, overdischarging and short circuit will seriously damage the battery performance and may cause use hazards. For this reason, cell phone batteries usually have a thin protective circuit board to prevent these risks.

3. Loaders are divided into direct loaders and seat loaders. Direct charging converts 220 AC mains power to 5 V DC, which is eentered into the mobile phone and is lowered by the mobile phone's charging circuit to be used by the battery. Generally, it will be delivered when purchasing a mobile phone. The charger is directly connected to the battery and converts the mains power into the required voltage for the battery to use.

4. If you want to use a charger, try to choose original or high-quality products. If the base charging circuit is of poor quality, there will be charging risks.

5. Lithium-ion batteries do not have a memory effect, but are inert if not used for a long time they can become passivated. They can regain their best performance by rinsing them several times.

6. Lithium batteries do not need to be specially discharged before charging. Some fast chargers only indicate 90% full charge when the light change, and the charger automatically switches to slow charging to fully charge the battery. But generally speaking, as long as it shows full, it can be removed.

7. In order not to damage the battery life, it is best to charge slowly when charging; the time should not be too long.

8. There is self-discharge in cell phone batteries because over-discharging will damage the battery. If the cell phone battery is not used for a long time, it should be ensured that it is well charged. certain amount of power.

9. Although our mobile phone is within the network coverage area, our mobile phone is no longer able to receive and make calls when it is turned off and charging. At present, we can use the missed call forwarding function of the mobile phone to transfer the mobile phone to the phone.landline around us to avoid losing incoming calls. This method is also applicable when the mobile phone is not within network coverage. area where the signal is weak and cannot be connected temporarily.

10. Do not expose the battery to high temperatures or intense cold. For example, during summer days you should not leave your cell phone in the car to expose it to the scorching sun; Take it to an air-conditioned room and place it where the air conditioner blows directly. When charging, the battery is a little hot. This is normal, but you can't let it withstand the "suffering" of high temperature. To prevent this from happening, it's best to charge at room temperature and not cover the phone with anything.

11. The longer the charging time, the better. For lower quality batteries without protection circuits, charging must be stoppedremoved once they are fully charged. If not used for a long time, the battery should be separated from the mobile phone.

12. The newly purchased battery does not need to be charged for 12 hours for the first time, but it is better to complete a full charge and discharge process for 3-5 hours. 100% normally, and full discharge means the mobile phone uses low power when recalled. Because the battery needs to go through filling, forming, electrolyte charging and discharging, capacity sharing and other processes before leaving the factory, so that the battery is in an activated state. However, after leaving the factory, it takes at least one month. a year before it can reach the user's hands. Because the battery is automatically due to the influence of discharge, the battery material becomes passivated at this time -There the battery can be activated by a full charge and discharge.

What should be noted when using lithium batteries is that the battery enters a dormant state after being left for a period of time. At that time, the capacity is lower than the normal value and the usage time is also lower. shortcut. However, lithium batteries are easy to activate. After 3-5 normal charge and discharge cycles, the battery can be activated and restored to its normal capacity. Due to the characteristics of the lithium battery itself, it has almost no memory effect. Therefore, the user's new mobile phone lithium battery does not require special methods and equipment during the activation process. Not only is this true in theory, but from my own practice, the "natural activation" method of loading using standard methods from the beginningt is the best.

The rechargeable battery should be written "RECHARGEABLEBATTERY", and the battery capacity will usually be marked on the rechargeable battery, for example 1600mAh, 2000mAh, and there will also be a sign of the rechargeable battery. battery type, such as Ni-MH (nickel hydrogen), Ni-Cd (nickel cadmium), there are currently five categories in the market: nickel cadmium, nickel metal hydride, lithium ion, lead storage and lithium iron.

As stated above, warning: Battery may explode or leak or be thrown into fire. ＝Warning: If charged or thrown into fire, the battery may explode or leak. This is not a rechargeable battery.