In principle, battery damage basically comes from two aspects:

　　On the one hand, when the battery is charged and discharged, the cathode and anode of the battery will shrink and expand with the release and absorption of ions. Long-term fast charging will destroy the chemicals on the battery, resulting in shortened battery life.

　　On the other hand, during fast charging, due to the relatively high current, the thermal effect of the current will be intensified, causing the battery to generate high temperatures. High temperatures will also cause a sudden reduction in capacity and permanent damage to the battery cells.

　　As we all know, one of the advantages of lithium batteries is that they can be charged at any time at a convenient time, instead of having to recharge after running out of electricity. So, what is a charging cycle?

　　Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

　　Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ Support maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate ≥70%

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　　A charging cycle means that all the battery's power is used from full to empty, and then charged from empty to full. This is not the same as charging once. To put it simply, for a 600 mAh lithium battery, you charge it from 0 mAh to 400 mAh for the first time, and use N milliamps; then you charge it to 150 mAh, and then use N milliamps. A; finally charge 100 mA. When the last charge reaches 50 mA, a charging cycle of this battery is completed. (400+150+50=600)

　　A lithium battery only uses half of its charge on the first day, then charges it fully. If it is still the same the next day, that is, if you charge it half way, and charge it twice in total, this can only be counted as one charging cycle, not two. Therefore, it may often take several charges to complete a cycle. Each time a charging cycle is completed, the battery capacity will decrease a little. This is why many people who use lithium battery mobile phones often say: "This broken mobile phone can be used for 4 days when I first bought it, but now it can only be used for 3 and a half days on a single charge." However, this reduction in power is very small. High-quality batteries will still retain 80% of their original power after multiple charging cycles. Many lithium-ion powered products are still in use after two or three years. Of course, lithium batteries will eventually need to be replaced when their life span is up.

　　The life of lithium batteries is generally 300-500 charging cycles. Assuming that the power provided by a complete discharge is 1Q, if the reduction in power after each charging cycle is not taken into account, the lithium battery can provide or supplement a total of 300Q-500Q of power during its life. From this we know that if you charge 1/2 every time, you can charge it 600-1000 times; if you charge it 1/3 every time, you can charge it 900-1500 times. By analogy, if it is charged randomly, the number of times is uncertain. In short, no matter how you charge it, the total amount of electricity added is 300Q-500Q, which is constant. Therefore, we can also understand this: the life of lithium battery is related to the total charging capacity of the battery, and has nothing to do with the number of charging times. There is little difference in the impact of deep discharge, deep charge and shallow discharge on the life of lithium batteries.

　　In fact, shallow discharge and shallow charging are more beneficial to lithium batteries. Deep discharge and deep charging are only necessary when the power module of the product is calibrated for lithium batteries. Therefore, products powered by lithium batteries do not have to stick to the process. Everything is done with convenience in mind. You can charge them at any time without worrying about affecting their lifespan.

　　Therefore, lithium batteries also have life problems under normal charging conditions. Each charge will also cause a little damage to the battery, but this damage is minimal and will take up to a year or more to show up on the phone. Therefore, whether it is fast charging or normal charging, it will actually cause irreversible damage to the battery, but the damage of fast charging will be slightly stronger than that of normal charging. However, with the various guarantees of current fast charging technology, this kind of battery damage is still safe and reasonable.

　　At present, most companies that provide fast charging solutions do not give out their impact on battery life from a battery perspective. However, according to national standards, a battery with a battery capacity of more than 80% after 500 charge and discharge times is qualified within one year. Little impact on use.

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