Lithium-ion battery life
Lithium-ion battery life is related to the number of completed charging cycles, not directly related to the number of charging cycles. The life of a lithium-ion battery is 500 times, which refers not to the number of times of charging, but a cycle of charging and discharging.
A charging cycle means that all the power of the battery is from full to empty, and then from empty to full, which is not equivalent to one charge. For example, a lithium battery is only half charged on the first day, and then fully charged. If the next day is still the same, that is, half of the charge, a total of two charges down, this only counts as one charge cycle, not two. Therefore, it may usually take several charges to complete a cycle. Each time a charge cycle is completed, the battery capacity decreases a little. However, this reduction in power is very small. High-quality batteries will still retain 80% of their original capacity after being charged for many cycles. Many battery-powered products are still used as usual after two or three years.
Of course, lithium-ion batteries still need to be replaced at the end of their lifespan. The so-called 500 times means that the manufacturer has reached 500 charging cycles. Due to various effects of real life, especially the depth of discharge during charging is not constant, 500 charging cycles can only be used as a reference battery life.
Therefore, we can also understand it this way: the life of a lithium-ion battery is related to the total charging capacity of the battery, and has nothing to do with the number of charging times. Deep discharge and deep charge and shallow discharge and shallow charge have little difference on the life of lithium battery. In fact, shallow discharge and shallow charge are more beneficial for lithium batteries. Only when the power module of the product is calibrated for lithium batteries, is it necessary to deep discharge and charge deeply. Therefore, products powered by lithium-ion batteries do not have to be bound by the process, everything is convenient, and they can be charged at any time without worrying about affecting their lifespan.