At the beginning, the individual cycle life of the 3.7V 18650 lithium battery can reach about 500~1000 times, and the individual life of the 3.2V 18650 can reach more than 2000. Of course, the premise is that it is a qualified battery produced by a regular manufacturer. If it is a defective or mixed battery, the service life will be very short. The service life of 18650 lithium batteries is only two to three years.
Individual lithium batteries may be charged 300-500 times. Partial discharge of lithium batteries instead of complete discharge, and try to avoid frequent complete discharge. Once the battery is off the production line, the clock begins to move. Whether you use it or not, the service life of lithium batteries is only two to three years.
The life of 18650 lithium battery is 300-500 charging cycles. Assuming that the power supplied by a complete discharge is Q, if the current power reduction in each charging cycle is not taken into account, lithium
electricity may supply or make up for 300Q-500Q in total during its life. From this, we know that if you charge 1/2 at a time, you may charge 600-1000 times; if you charge 1/3 at a time, you may charge 900-1500 times. By analogy, if it is charged randomly, the number of times will be variable.
A saying that people often hear is that the life of lithium batteries is; 500 times; in the principle of lithium batteries; times; refers to the
reincarnation life, that is, a complete charge and discharge cycle. The test method in the industry is: discharge depth × number of charges = cycle life. In terms of value, the discharge depth is 80%, at least 625 times of charge and discharge, that is, 80% × 625 = 500 (times).
In short, no matter how it is charged, the total power of 300Q to 500Q is constant. Therefore, we may also understand that the life of lithium batteries is related to the total charging power of the battery, and it has nothing to do with the number of charges. The impact of deep and shallow charging on lithium battery life is not much different from that of shallow charging.
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