18650 lithium-ion batteries generally have the advantages of large capacity, long life, high safety performance, and wide range of use. No matter which manufacturer produces the 18650 lithium-ion battery, the dimensions are the same, the difference is the maximum capacity and the highest energy density ratio that can be achieved. When purchasing a 18650 lithium-ion battery, you generally need to understand its capacity, current, voltage, and operating temperature and choose a suitable 18650 lithium-ion battery.

18650 lithium-ion battery

1. Electrical equipment
According to the requirements of the electrical appliance, select the applicable battery type and size, and purchase the battery suitable for the electrical appliance according to the size and characteristics of the power consumption of the electrical appliance.

2. Nominal capacity
The nominal capacity of the 18650 lithium-ion battery is related to its endurance, and the unit is "mAh". The higher the capacity, the stronger the endurance. For example, a 2800mAh battery can be discharged continuously for 2 hours at a current of 1.4A.

3. Charge and discharge rate
Charge and discharge rate = charge and discharge current (A) / rated capacity (Ah)

The charge-discharge rate refers to the current value required by the battery to discharge its rated capacity within a specified time, which is numerically equal to the multiple of the battery's rated capacity. The unit of battery discharge rate is generally C (short for C-rate), such as 0.5C, 1C, 5C, etc.

4. Battery internal resistance
The internal resistance is the resistance of the battery itself. The smaller the internal resistance, the lower the consumption and the stronger the discharge capacity. The parameter of internal resistance is generally written on the battery introduction page. You should also pay attention to it when purchasing. Try not to use it. Buy more than 100mΩ or more cells.

5. Operating temperature
Temperature is a major factor affecting the life of 18650 lithium-ion batteries. The higher the temperature, the faster the aging of the lithium-ion battery will be, and the higher the temperature, the greater the damage to the interior of the lithium-ion battery.

6. Pointed and flat
The so-called pointed and flat heads are designed by each manufacturer according to their own assembly requirements, battery safety, battery capacity, and other factors, and there is no difference in essence.

7. With and without a protective plate
The 18650 lithium-ion battery with a protective plate is a few mm taller than a 18650 lithium-ion battery without a protective plate, and it is also slightly more expensive, but it is safer. The 18650 lithium-ion battery with a protective plate can prevent the battery from being over-discharged (over-discharge will cause the lithium battery to heat up, even burn and explode).

The above is the introduction to how to buy 18650 lithium-ion batteries. Chung Pak, a 18650 lithium-ion battery factory in China, produces batteries with large capacity and long service life. We will update relevant articles and products from time to time, and provide relevant product information and materials, and look forward to your visit and consultation.