Maintenance charging method

Regarding the lithium battery manufacturer’s problem with battery life, the sales staff in Computer City often say: You can charge it 100 times. If you have it, that’s interesting. In fact, the correct statement should be that the life of a lithium battery is related to the number of recharges, and there is no ambiguous relationship between the number of recharges.

A well-known advantage of 　　 lithium batteries is that they can be charged at a convenient time, not after the battery is exhausted. So, what is the charge cycle? The charge cycle is the process of all batteries from full to empty, from empty to full, which is different from a single charge. Simply put, when you charge a lithium battery for the first time, you use n mA from 0 to 400 to 600 mA; then you charge 150 mA, n mA; finally, you charge 100 mA, when you When the final charge is 50 mA, the battery will begin to cycle. (400 + 150 + 50 = 600)

The lithium battery has only half of the charge on the first day, and then is fully charged. If the next day is the same, that is, half of the charging time, and there are two charges, it counts as one charging cycle instead of two. Therefore, it may take several charges to complete a cycle. At the end of each cycle, the charge drops a bit. This is why many lithium-ion mobile phone users often say: This broken mobile phone can be used for four days after you buy it. Now it only charges once in three and a half days. However, the reduced power consumption is very small. After many recharges, the advanced battery can still retain 80% of its power. Many lithium-ion power products are still in use after two to three years. Of course, the lithium battery will eventually have to be replaced.

The service life of a lithium battery is usually 300-500 times. Assuming that the power provided by a complete discharge is 1Q, if the power reduction after each charge is not considered, the total power provided or supplemented by the lithium battery during its service life can reach 300Q-500Q. We know that if you use 1/2 charge, you can charge 600-1000 times, if you use 1/3 charge, you can charge 900-1500 times. and many more. If the charge is random, the degree is uncertain. In short, no matter how the battery is charged, the power of 300Q-500Q is constant. Therefore, we can also understand that the life of a lithium battery is related to the total charge capacity of the battery, and has nothing to do with the number of recharges. The impact of deep charging on the life of the lithium battery is not significant. Therefore, some MP3 manufacturers advertise that some MP3 models use powerful lithium batteries that can be recharged more than 1500 times, which is completely ignorant to deceive consumers.

In fact, light discharge and light charge are more conducive to the development of lithium batteries. Only when the product’s power module is calibrated to a lithium battery, can deep discharge and deep charge be performed. Therefore, there is no need to adhere to the process to use lithium-ion power products, all for convenience, charge at any time, do not worry about the impact on life.