Industry News

How long is the service life of 18650 lithium battery?


At the beginning, the 3.7V 18650 lithium battery has an individual cycle life of about 500 to 1000 times, and the 3.2V 18650 individual lifespan can reach more than 2000. Of course, the premise is that the qualified battery produced by the regular manufacturer, if it is a defective or mixed battery, the lifespan will be longer. very short. The service life of 18650 lithium batteries is only two to three years. Individual lithium batteries may be charged and discharged 300-500 times. Partial discharge of lithium batteries, not full discharge, and frequent full discharges should be avoided as much as possible. Once the battery is off the production line, the clock starts to run. Whether you use it or not, the service life of lithium batteries is only two to three years. The life of the 18650 lithium battery is 300 to 500 charging cycles. Assuming that the power supplied by a complete discharge is Q, if the reduction of the current power in each charging cycle is not considered, the lithium battery may supply or make up for 300Q-500Q of power in total during its life. From this, we know that if you charge 1/2 every time, you can charge 600-1000 times; if you charge 1/3 every time, you can charge 900-1500 times. And so on, if random charging, the number of times is not fixed. A statement that people often hear is that the life of lithium batteries is; 500 times; the principle of lithium batteries means; times; refers to the cycle life, that is, a complete charge and discharge cycle. The test method in the industry is: depth of discharge. × number of charging times = cycle life, the depth of discharge is 80% numerically, at least 625 times of charging and discharging, that is, 80% × 625