How much power is maintained in the mobile phone lithium battery is most conducive to energy storage? Nowadays, mobile phones and laptops have become necessities in people's lives. One of the most intolerable things in life is that the batteries of mobile phones and laptops suddenly run out. More and more people are beginning to worry about improper use of batteries and reducing their life. If you want to maximize the effectiveness of lithium batteries and extend the life of lithium batteries, you need to master the correct charging method. But when the battery is not in use, how to store the lithium battery is worth the storage capacity?
How much power is stored in the lithium battery?
In fact, lithium batteries are not afraid of charging, but are afraid of running out of electricity. How do you say? Many batteries have so-called "charging management ICs", so that the battery will not explode when it is charging, and it will not cause the battery to be too low to start the charging process because of the lack of electricity. Therefore, if the lithium battery is out of power and left uncharged after a long period of time, it is likely that the voltage will be too low and the battery will be discarded prematurely. If the lithium battery is not used for a long time, it is best to retain 40% of the power.
Several factors are considered to determine the main source of this capacity:
1. Lithium-ion battery self-discharges, if it is not charged, it will cause the battery to be over-discharged, thereby making the lithium-ion chemical activation purity and reducing the recovery capacity
2. If the lithium-ion battery is shipped at 100% power, it will bring risks during transportation or storage, because when fully charged, lithium-ion is the most active, and the safety hazard is also the biggest
3. According to the measured data of most battery factories, shipping with 50% power can guarantee its storage for more than one year, the voltage is still above 3.2V, and the recovery capacity is more than 98%.
Can reduce the number of recharges to extend the life of the lithium battery?
The current lithium battery capacity loss is calculated by charging "cycles". According to Apple's official statement, the calculation of the number of cycles is based on the cumulative percentage of each battery discharge as a charging cycle, that is, the battery starts from 0 A charge cycle is counted as 100%. If it is charged from 50% to full charge, it is considered a half charge cycle. It does not mean that one charge is one cycle. Therefore, there is no need to wait until the battery is low before charging.
Lithium batteries have no memory effect and can be recharged at any time. In order to reduce the number of recharges, deliberately using up the battery before fully recharging it will not extend the battery life, but will have a negative impact on the battery life.
In fact, lithium battery charging pays attention to "eat less and more meals", and frequent shallow charging and discharging can help extend its life.
The correct way to charge the old lithium battery
1. Charging method
Old batteries refer to batteries that have been charged and discharged many times, not batteries that are scrapped. The life of a lithium battery has nothing to do with the number of charging and discharging. It has no memory effect. No matter how you charge it, it will not affect the number of charging cycles. Therefore, do not charge the battery until it is completely empty. It is best to charge the battery as much as possible when you can charge it. The charging time should be within 2-3 hours. Of course, you don’t have to be fully charged.
2, charging voltage
The safe working voltage range of lithium battery is 2.8 to 4.2V. Below or higher than this voltage range, the lithium ions in the battery become very unstable and even cause accidents. In order to ensure that the battery is in a safe range, a special charger is required. These chargers automatically adjust the charging method according to the current state of the battery.
3, charging tools
Lithium batteries should be charged with a special charger, which can guarantee the safety of charging. When the charger works, it charges the battery with a constant current. As the battery voltage increases, the charger increases the charging voltage at the same time to speed up the charging speed. When the battery reaches the 4.2V cut-off voltage, the battery only charges about 70% (not full) at this time. At this time, the charger continues to charge the battery with a constant voltage and a gradually decreasing current. When the value is less than 0.1A, the battery voltage continues to rise when the battery voltage continues to rise.
4, regular charging
Lithium batteries that have not been used for a long time should be stored in a cool and dry place in a half-charged state. Fully charged storage is dangerous, and the battery will be damaged, but without power storage, the battery may be destroyed and lose its function. In the storage process, every 3--6 months, a charging cycle must be completed and a power calibration will be done.
In daily life, it may take several times of charging to complete a cycle. Every time a charging cycle is completed, the battery capacity will decrease a bit. However, this reduction in power is very small. High-quality lithium batteries will still retain 80% of the original capacity after being charged for multiple cycles. Many lithium-powered products are still used as usual after two or three years. Of course, the lithium battery still needs to be replaced after the end of its life.