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Advantages of 18650 lithium batteries:

1. Wide range of use;

(1) Laptops, walkie talkies, portable DVDs, instruments, audio equipment, aircraft models, toys, cameras, digital cameras and other electronic devices.

2. Series connection;

(1) It can be combined in series or parallel to form an 18650 lithium battery pack.

3. Low internal resistance;

(1) The internal resistance of polymer cells is smaller than that of general liquid cells,

(2) The internal resistance of domestically produced polymer cells can even reach below 35m Ω, greatly reducing the battery's self consumption and extending the standby time of mobile phones, which can fully reach the level of international standards.

4. No memory effect;

(1) There is no need to empty the remaining battery before charging, making it convenient to use.

5. High safety performance;

(1) 18650 lithium batteries have high safety performance, do not explode or burn; Non toxic and pollution-free.

6. Long service life;

(1) The service life of 18650 lithium batteries is very long, with a cycle life of over 500 times during normal use, which is more than twice that of ordinary batteries.

7. Large capacity;

(1) The capacity of a 18650 lithium battery is generally between 1200mah and 3600mah, while the capacity of a typical battery is only around 800.

18650 is a standardized lithium-ion battery model established by Japanese company SONY, the pioneer of lithium-ion batteries, in order to save costs. 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery.

The common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The nominal voltage of lithium-ion batteries is 3.7V, and the charging cutoff voltage is 4.2V. The nominal voltage of lithium iron phosphate batteries is 3.2V, and the charging cutoff voltage is 3.6V. The capacity is usually 1200mAh to 3350mAh, and the common capacity is 2200mAh to 2600mAh.

Lithium ion batteries: Lithium ion batteries have the advantages of light weight, large capacity, and no memory effect, making them widely used - many digital devices use lithium-ion batteries as power sources, although they are relatively expensive. Lithium ion batteries have a high energy density, with a capacity 1.5 to 2 times that of nickel hydrogen batteries of the same weight, and have a very low self discharge rate. In addition, lithium-ion batteries have the advantages of almost no "memory effect" and no toxic substances, which are also important reasons for their widespread application. Additionally, please note that lithium batteries are generally labeled with English 4.2V lithium-ion battery (lithium battery), 4.2V lithium-ion secondary battery (lithium secondary battery), or 4.2V lithium-ion rechargeable battery (rechargeable lithium battery) on the outside. Therefore, when purchasing batteries, users must carefully read the markings on the outer surface of the battery block to prevent cadmium nickel and hydrogen nickel batteries from being mistaken for lithium batteries due to unclear battery types. The standard for lithium batteries is the same for 3.7V or 4.2V. It's just that the manufacturer's labeling is different. 3.7V refers to the platform voltage (i.e. typical voltage) at which the battery is discharged during use, while 4.2V refers to the voltage at full charge. The common rechargeable 18650 lithium batteries have a voltage standard of 3.6 or 3.7V, and when fully charged, it is 4.2V, which has little to do with the amount of electricity (capacity). The mainstream capacity of 18650 batteries ranges from 1800mAh to 2600mAh (18650 power batteries often have a capacity of 2200-2600mAh), and the mainstream capacity even includes those with a standard of 3500 or 4000mAh or above (it is reminded that domestically produced cells with a nominal capacity of 3350mAH or above on the market may be fake, and the maximum capacity currently produced in China is 3350mAh).

It is generally believed that when the no-load voltage of a lithium battery is below 3.0V, it is considered to have run out of battery (the specific value depends on the threshold value of the battery protection board, for example, there are as low as 2.8V and as low as 3.2V). Most lithium batteries should not be discharged with a no-load voltage below 3.2V, otherwise excessive discharge will damage the battery (generally, lithium batteries on the market are only used with protective plates, so excessive discharge can also cause the protective plate to not detect the battery, making it unable to charge the battery). 4.2V is the maximum limiting voltage for battery charging. It is generally believed that charging the no-load voltage of a lithium battery to 4.2V is considered fully charged. During the battery charging process, the voltage gradually rises from 3.7V to 4.2V. Charging a lithium battery cannot charge the no-load voltage above 4.2V, otherwise it will also damage the battery. This is the special feature of lithium batteries.

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