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18650 battery life theory is 1000 cycles of charging. Because of the large capacity of unit density, it is often used for notebook batteries. In addition, because of the excellent stability of the 18650 in operation, the 18650 lithium-ion battery is made up of three components at the same time during production, and these three components have their own work. The common 18650 lithium ion batteries are divided into lithium ion batteries, lithium iron phosphate batteries and nickel hydrogen batteries.

1. Lithium ion battery: lithium element exists in the battery in the form of lithium ion (usually lithium salt).

The self-discharge phenomenon of lithium-ion batteries. If the battery voltage is kept below 3.6V for a long time, it will lead to over-discharge of the battery, damage the internal structure of the battery and reduce the battery life. Therefore, the lithium-ion battery that has been stored for a long time should be recharged every 3 to 6 months, that is, charged to a voltage of 3.8~3.9V (the lithium-ion battery and the optimal storage voltage is about 3.85V), and kept at a discharge depth of 40% - 60%, and should not be fully charged.

2. Nickel-cadmium battery: It is also an earlier battery. That is, the rechargeable battery of Walkman that is widely used at present. The nominal voltage of a single battery is 1.25 V, and its capacity (the capacity of a rechargeable battery is expressed by multiplying the current (mA) by the hour (h).

Nickel-cadmium battery has a phenomenon called memory effect. When people charge the nickel-cadmium battery that has not been discharged completely, the battery will automatically remember this point that has not been discharged completely. When the next charge reaches this point, it will show the same characteristics as the battery discharge. In this way, although the battery is not fully discharged, its capacity is also reduced at this time. This is the so-called memory effect. Its essence is the appearance of dendritic crystal structure in the electrode. This memory effect is unique to nickel-cadmium batteries.

3. Lithium iron phosphate: It is a new type of electrode material for lithium ion batteries. It is characterized by large discharge capacity, low price, non-toxicity and no environmental pollution.

The performance of lithium-ion batteries depends on the positive and negative electrode materials. Lithium iron phosphate as the cathode material of lithium-ion batteries has only emerged in recent years. The domestic development of large-capacity lithium iron phosphate batteries was in July 2005.

The 18650 numbers in the 18650 lithium-ion battery represent the external dimensions: 18 refers to the battery diameter of 18.0mm, and 650 refers to the battery height of 65.0mm. The common 18650 batteries are divided into lithium ion batteries, lithium iron phosphate batteries and nickel hydrogen batteries. Voltage and capacity specification: the voltage of NiMH battery is 1.2V, the common capacity is 2500MAH, the voltage of lithium-ion battery is 3.6V, and the common capacity is 1500MAH-3100MAH.

The energy density of lithium ion battery is very high, its capacity is 1.5~2 times that of nickel hydrogen battery of the same weight, and it has very low self-discharge rate. In addition, lithium-ion batteries have almost no memory effect and no toxic substances, which are also important reasons for their wide application.

In addition, please note that the exterior of lithium-ion batteries is generally marked with 7.2Vlithium-ion battery, 7.2Vlithium-secondary battery and 7.2Vlithium-ion rechargeable battery in English, so users must see the marks on the exterior of the battery block when purchasing batteries to prevent the nickel-cadmium and nickel-hydrogen batteries from being mistaken for lithium-ion batteries because they do not see the battery type clearly.

18650 lithium-ion battery has the following advantages

1. Wide range of use

Laptops, walkie-talkies, portable DVDs, instruments, audio equipment, aircraft models, toys, video cameras, digital cameras and other electronic equipment.

2. Tandem

18650 lithium-ion battery pack can be combined in series or parallel.

3. Low internal resistance

The internal resistance of polymer cells is smaller than that of ordinary liquid cells, and the internal resistance of domestic polymer cells can even reach 35mΩ Below, it greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone, which can fully reach the international standard. This polymer lithium battery supporting large discharge current is an ideal choice for remote control model, and it is the most promising product to replace Ni-MH battery.

4. No memory effect

It is convenient to use without emptying the remaining power before charging.

5. High voltage

The voltage of 18650 lithium-ion battery is generally 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of NiCd and NiMH batteries.

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