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18650 lithium-ion battery voltage parameters

1、 The core voltage of 18650 lithium-ion batteries is the working voltage, also known as the nominal voltage, which is 3.7V. This is equivalent to three nickel cadmium or nickel hydrogen batteries connected in series. Some domestic battery manufacturers also design a working voltage of 3.6V.

2、 Charging limit voltage: This is the maximum limit for the voltage of 18650 batteries, which is 4.2V. The charging process of 18650 lithium-ion batteries is the process of raising the voltage of the 18650 battery from 3.7V during operation to 4.2V. The process ends, indicating that the battery is fully charged. Exceeding 4.2V indicates overcharging, which can cause damage to the battery.

3、 Discharge termination voltage: The voltage of an 18650 lithium-ion battery drops to the minimum operating voltage that is not suitable for further discharge, which is 2.75V. If the battery is placed below the termination voltage, it is overdischarging, which can damage the electrode structure of the 18650 battery and cause irreversible reactions of lithium ions, seriously affecting the battery's lifespan.

The advantages of 18650 lithium-ion batteries

1. Large capacity. The capacity of 18650 lithium-ion batteries is generally between 1200mAh and 3600mAh, while the capacity of general batteries is only about 800. If 18650 lithium-ion batteries are combined to form an 18650 lithium-ion battery pack, the 18650 lithium-ion battery pack can easily exceed 5000mAh.

2. Long lifespan. The lifespan of 18650 lithium-ion batteries is very long, with a normal cycle life of over 500 times, which is more than twice that of ordinary batteries.

3. High security performance. 18650 lithium-ion batteries have high safety performance, no explosion, and no combustion; Non toxic, pollution-free, certified with RoHS trademark; All kinds of safety performance are achieved in one go, with more than 500 cycles; Good high temperature resistance, with a discharge efficiency of 100% at 65 degrees Celsius. To prevent battery short circuits, the positive and negative poles of 18650 lithium-ion batteries are separated. So the possibility of it experiencing a short circuit has been reduced to the extreme. Protective plates can be installed to prevent overcharging and overdischarging of the battery, which can also extend its lifespan.

4. High voltage. The voltage of 18650 lithium-ion batteries is generally at 3.6V, 3.8V, and 4.2V, much higher than the 1.2V voltage of nickel cadmium and nickel hydrogen batteries.

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