How to calculate the charge cycle of a lithium battery

As we all know, one of the advantages of lithium batteries is that they can be charged at any time and at the appropriate time, instead of having to recharge after a power outage. So, what is a charge cycle? A charge cycle means that all of the battery's energy is used from full to empty, then charged from empty to full. This is not the same as a single charge. 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, then use N milliamps to charge 100 A; mA When the last charge reaches 50 mA, a charging cycle of this battery is completed. (400+150+50=600) Steps/Methods A lithium battery only used half its power on the first day, then fully charged it. If it's still the same the next day, that is, if you charge it half and charge it twicetimes in total, this can only be counted as one charge cycle and not two. Therefore, multiple charges may often be required to complete a cycle. Each time a charge cycle is completed, the battery capacity decreases a little. This is why many people who use lithium battery cell phones often say: "This broken cell 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 power reduction is very small. High quality batteries still retain 80% of their original power after being charged for many cycles. Many lithium-powered products are still used as usual after two or three years. Of course, lithium batteries will eventually need to be replaced once their lifespan has expired. ThereLifespan of lithium batteries is generally 300 to 500 charge cycles. Assuming that the power provided by a full discharge is 1Q, if the power reduction after each charge cycle is not taken into account, the lithium battery can provide or supplement a total of 300Q to 500Q of power over of its lifespan. From this we know that if you charge 1/2 each time, you can charge it 600-1000 times; if you charge it 1/3 each 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 to 500Q, which is constant. Therefore, we can also understand this: the lifespan of a 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 inns the impact of deep discharge, deep charge and surface discharge on the lifespan of lithium batteries. Well, some MP3 manufacturers claim in their propaganda: “A certain model of MP3 uses a powerful lithium battery that can be recharged more than 1,500 times. » This is only to deceive consumers and lead them to ignorance. In fact, shallow discharge and shallow charge are more beneficial for lithium batteries. Deep discharge and deep charge are only necessary when the product's power module is calibrated for lithium batteries. Therefore, products powered by lithium batteries do not necessarily 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.