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What is the lifespan of 18650 lithium-ion batteries?

At present, the general cycle life of 3.7v18650 lithium-ion batteries can reach 500-1000 times, and the general life of 3.2v18650 lithium-ion batteries can reach over 2000 times. Of course, the premise is that legitimate manufacturers produce qualified batteries. If the battery is defective or fake, its lifespan will be very short.

The service life of 18650 lithium-ion batteries is generally 300-500 charges. Assuming that the electricity supplied by a complete discharge is Q, without considering the decrease in electricity after each charging cycle, lithium can supply or supplement a total of 300q-500q of electricity during its service life. From here, we understand that if you use 1/2 charging each time, you can charge 600 to 1000 times. If you charge 1/3 of the time, you can charge 900 to 1500 times. Similarly, if the battery is charged randomly, the number of charges will also vary.

Anyway, no matter how you charge, you can always get energy from 300Q to 500Q, which is a constant. Therefore, we can also understand that the lifespan of lithium-ion batteries is related to the total battery charge, and is not related to the amount of charge. The impact of deep and shallow charging on the lifespan of lithium-ion batteries is the same.

The theoretical lifespan of ternary lithium-ion batteries is about 800 cycles, making them the medium for commercial rechargeable lithium-ion batteries. Lithium iron phosphate has approximately 2000 cycles, while lithium titanate is said to have up to 10000 cycles. Currently, mainstream battery manufacturers promise to exceed 500 times their ternary battery specifications. However, after the battery pack is matched into a battery pack, the important reason is that the voltage and internal resistance cannot be exactly the same

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