What is the correct statement about the life of polymer lithium-ion batteries
The life of a lithium battery is related to the number of completions of the charging cycle, not directly related to the number of charging. Simple understanding, for example, a lithium battery used only half of its power on the first day, and then fully charged it. If the situation persists the next day, that is, use half of the charge and charge it twice in total. This can only be counted as one charge cycle, not two. Therefore, it may usually take several times to complete a cycle. Every time a charging cycle is completed, the power will decrease a bit. However, the reduction is very small. High-quality batteries will still retain 80% of the original power after charging for multiple cycles. Many lithium-powered products are still used as usual after two or three years. This is the reason.
Of course, the life of the lithium battery will eventually need to be replaced. The life of a lithium battery is generally 300 to 500 charging cycles. Assuming that the power supplied by a complete discharge is Q, if the reduction in power after each charging cycle is not considered, the lithium battery can supply or supplement 300Q-500Q of power in its life. From this we understand that if you charge 1/2 each time, you can charge 600-1000 times; if you charge 1/3 each time, you can charge 900-1500 times. By analogy, if it is charged randomly, the number of times is variable. In short, no matter how it is charged, it is constant to add 300Q to 500Q of power. Therefore, we can also understand this: Li-ion battery life is related to the total charge capacity of the battery, and has nothing to do with the number of charges. There is little difference between deep discharge and shallow charge on the life of lithium battery. In fact, shallow charging and shallow charging are more beneficial for lithium batteries. Only when the product's power module is calibrated for lithium batteries, is it necessary to deep discharge and deep charge. Therefore, products that use lithium battery power do not need to be constrained by the process. Everything is convenient and can be charged at any time without worrying about affecting life.
If the lithium battery is used in an environment higher than the specified operating temperature, that is, 35C or higher, the battery's power will continue to decrease, that is, the battery's power supply time will not be as long as usual. If the device is charged at such a temperature, the damage to the battery will be even greater. Even if the battery is stored in a hot environment, it will inevitably cause corresponding damage to the quality of the battery. Therefore, keeping the operating temperature as suitable as possible is a good way to extend the life of the lithium battery.
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