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One minute to teach you what is 18650 lithium battery!

It is understood that Japan's SONY company set a standard lithium-ion battery model to save costs, in which 18 means a diameter of 18mm, 65 means a length of 65mm, and 0 means a cylindrical battery. It is the 18650 originator of lithium-ion batteries. Our standard 18650 batteries are divided into lithium-ion and iron phosphate batteries. The voltage of the lithium-ion battery is 3.7v nominal voltage; the charging cut-off voltage is 4.2v, the nominal voltage of lithium iron phosphate battery is 3.2V, the charging cut-off voltage is 3.6v, and the capacity is usually 1200mAh-3350mAh, the standard power is 2200mAh-2600mAh.

Next, let's talk about the advantages and disadvantages of 18650 lithium batteries.


  1. Large capacity

A 18650 lithium battery is generally between 1200mah and 3600mah, and the available battery capacity is only about 800mah. If combined into a 18650 lithium battery pack, the 18650 lithium battery pack can easily exceed 5000mah.

  1. Long life

The 18650 lithium battery has a long service life, and the cycle life can reach more than 500 times during everyday use, which is more than twice that of ordinary batteries.

  1. High safety performance

18650 lithium battery has high safety performance, no explosion, no combustion; non-toxic, non-polluting, RoHS trademark certification; various safety performances in one go, the number of cycles is more than 500 times; high-temperature resistance performance, discharge efficiency of 100% under the condition of 65 degrees. To prevent the short circuit of the battery, the positive and negative electrodes of the 18650 lithium battery are separated. Therefore, the possibility of short-circuiting has been reduced to the extreme. It can add a protection board to avoid overcharging and over-discharging of the battery, which can also prolong the service life of the storm.

  1. High voltage

The voltage of the 18650 lithium battery is generally 3.6V, 3.8V, and 4.2V, which is much higher than the 1.2V voltage of nickel-cadmium and nickel-metal hydride batteries.

  1. No memory effect, easy to use

No memory effect. You don't have to drain the remaining power before charging.

  1. Small internal resistance:

The internal resistance of the polymer battery is smaller than that of the available liquid battery, and the internal resistance of the domestic polymer battery can even be below 35mΩ, which significantly reduces the self-consumption of the storm and prolongs the standby time of the mobile phone. International level. This polymer lithium battery that supports a large discharge current is ideal for remote control models and has become the most promising product to replace nickel-metal hydride batteries.

  1. It can combine in series or in parallel to form a 18650 lithium battery pack
  2. Wide range of use

It can use in notebook computers, walkie-talkies, portable DVDs, instrumentation, audio equipment, model aircraft, toys, video cameras, digital cameras, and other electronic equipment.


  1. Fixed volume

The most significant disadvantage of the 18650 lithium battery is that its volume has been fixed, and it is not very well positioned when installed in some notebooks or some products. Of course, this disadvantage can also be said to be an advantage, which is compared to other lithium batteries, such as polymer lithium batteries. This is a disadvantage in terms of customizable and resizable. It has become an advantage compared to some products with specified battery specifications. The 18650 lithium battery is prone to short circuits or explosions, also relative to the polymer lithium battery. If it is relatively ordinary batteries, this disadvantage is not so obvious.

2. must need to protect the circuit

18650 lithium battery production requires protection circuits to prevent the battery from being overcharged and causing discharge. Of course, this is necessary for lithium batteries, which is also a disadvantage of lithium batteries because the materials used in lithium batteries are lithium cobalt oxide materials, and lithium batteries made of lithium cobalt oxide materials cannot discharge large currents and are safer. Difference.

  1. High production requirements

18650 lithium battery requires high production conditions. Compared with general battery production, 18650 lithium battery has high requirements for production conditions, which undoubtedly increases the production cost.


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