1. What is a mobile phone battery:
Mobile phone batteries are energy storage tools that provide electricity for mobile phones. They are composed of three parts: battery cells, protection circuits and casing. Mobile phone batteries generally use lithium batteries and nickel-metal hydride batteries.
mAh" is the unit of battery capacity, and the Chinese name is milliampere hour
2. How to charge the mobile phone battery:
Regarding the issue of "activation" of lithium batteries, many claims are: the charging time must exceed 12 hours, and full charge and discharge are repeated three times in order to activate the battery. This statement of "the first three charges must be charged for more than 12 hours" is for rechargeable batteries in the 1990s. The nickel-cadmium batteries at that time had a memory effect and needed to be fully charged to ensure battery capacity. The mobile phone uses a lithium-ion battery, which has no memory effect. Generally, it can be fully charged in 2-3 hours, which is sufficient. If the first three charging and discharging of the new battery can really reach 12 hours or more, it will cause great damage to the battery, and may cause the battery to swell or even burn. Fortunately, both the mobile phone and the charger have protection circuits. When it is charged to 100%, it will automatically power off, and it will not continue to charge when it is plugged into the charger. However, it is better to unplug the charger at this time to prevent the charger's protection circuit from overcharging, causing serious damage to the battery materials and affecting the battery's capacity and life. Generally, the charging method described in the mobile phone manual is the standard charging method suitable for the mobile phone.
1. The mobile phone battery is composed of three parts: the battery cell, the protection circuit and the shell. The current mobile phone batteries are all lithium-ion batteries (usually referred to as lithium batteries in irregular situations), and the cathode material is lithium cobalt oxide. The standard discharge voltage is 3.7V, the charge cut-off voltage is 4.2V, and the discharge cut-off voltage is 2.75V. The unit of power is Wh (watt hour), because the standard discharge voltage of mobile phone batteries is 3.7V, so mAh (milliampere hour) can also be used instead. The conversion relationship between these two types of units on the mobile phone battery is: Watt hour = Ampere hour × 3.7.
2. Overcharge, overdischarge and short circuit will seriously damage the performance of the battery, and may lead to risks of use. For this reason, there is generally a slender protection circuit board in the mobile phone battery to prevent these risks.
3. The charger is divided into direct charge and seat charge. Direct current converts 220 AC mains power into 5V DC, which is input into the mobile phone and used by the mobile phone's charging circuit to step down the voltage to the battery. Generally, there will be delivery when buying a mobile phone. The charger is directly connected to the battery, and converts the mains power to the required voltage for the battery.
4. If you want to use a cradle charger, please try to choose original or excellent quality products. If the charging circuit in the cradle is of poor quality, there will be a charging risk.
5. Lithium-ion battery has no memory effect, but it is inert. If it is not used for a long time, there may be passivation. The best performance can be restored after several times of charging and discharging.
6. Before charging, the lithium battery does not need to be specially discharged. Some fast chargers only indicate that they are 90% full when the indicator light changes, and the charger will automatically change to use slow charging to fully charge the battery. But generally speaking, as long as the display is full, it can be removed.
7. In order not to damage the battery life, it is best to charge slowly when charging; the time does not need to be too long.
8. Mobile phone batteries have self-discharge, because over-discharge will damage the battery. If the mobile phone battery is not used for a long time, it should be ensured that the battery has a certain amount of power.
9. Although our mobile phone is within the network coverage area, our mobile phone can no longer accept and make calls when the mobile phone is turned off and charged. At this time, we can use the mobile phone's untalked transfer function to transfer the mobile phone to a fixed phone nearby to prevent the loss of incoming calls. 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 severe cold, like in the dog days, don't put the mobile phone in the car to withstand the scorching sun; or take it in an air-conditioned room and place it in a place with direct air-conditioning. When charging, it is normal for the battery to have a little heat, but it should not be subjected to high temperature "suffering". In order to avoid this situation, it is best to charge at room temperature and do not cover anything on the phone.
11. When charging, the longer the better, the charging should be stopped after the inferior battery without protection circuit is fully charged. Separate the battery from the phone if it is not used for a long time.
12. The newly-purchased battery does not need to be charged for 12 hours for the first use, but it is best to perform a full charge and discharge process for 3 to 5 hours. Full charge means normal charge to 100%, and full discharge means when the phone is used to remind when the battery is low. Because the battery has to go through the process of filling electrolyte, forming, charging and discharging, and dividing the capacity before leaving the factory, so that the battery is in the activated state, but after leaving the factory, it takes as little as a month to more than a year to reach the user's hands. Due to the influence of discharge, the battery material becomes passivated. At this time, the battery can be activated through full charge and discharge.
In the use of lithium batteries, it should be noted that after the battery is left for a period of time, it will enter the dormant state. At this time, the capacity is lower than the normal value, and the use time is also shortened. But the lithium battery is easy to activate, as long as 3-5 normal charge and discharge cycles can activate the battery and restore normal capacity. Due to the characteristics of the lithium battery itself, it is determined that it has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not require special methods and equipment during the activation process. Not only is this true in theory, but from my own practice, it is best to use the standard method of charging from the beginning, which is the "natural activation" method.
3. Mobile phone battery charging time:
The mobile phone battery comes with a protection board. This protection board will automatically cut off the power when conditions are available.
A. Overcharge protection. That is, the battery will automatically stop charging when it is full.
B. Over-discharge protection. That is, the battery will automatically stop discharging when 3.2V is used.
C. Short circuit protection. That is, the battery will be automatically disconnected if it is accidentally short-circuited.
That is to say, the general battery is full in about 2-3 hours of charging. After being full, the charging circuit has actually been disconnected. So it is meaningless.