How to choose a high-quality 18650 lithium battery?

　　Select the 18650 lithium battery that is most suitable for us according to our electrical equipment, such as the appropriate brand, voltage, capacity, continuous discharge rate, battery life, etc. The most important thing is to choose the battery with high safety. Now we will introduce them in detail:

　　1. Brand

　　As for brands, Sanyo, Samsung, SONY, LG and other international famous brands are relatively reliable at present.

　　Sanyo and LG mainly focus on conventional applications, such as glare flashlights, power packs, notebook batteries, etc.

　　SONY is professional, mainly driving high current. Take VTC4 as an example, the discharge current can reach 30A, electronic cigarettes, toys, etc., can be easily competent.

　　2. Nominal capacity

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

　　3. Continuous discharge current (CDR)

　　Continuous discharge capacity is expressed in C, and continuous discharge current=continuous discharge capacity C × Capacity.

　　For example, if the capacity of an 18650 battery is 2800mAh and the continuous discharge capacity is 0.5C, then the continuous discharge current=1.4A. If the battery is discharged beyond 1.4A for a long time, the battery life will be seriously affected, and there may be dangers such as overheating, even burning, explosion, etc.

　　5. Internal resistance

　　The internal resistance is the resistance of the battery itself. The smaller the internal resistance is, the less the consumption is. The stronger the discharge capacity is. The internal resistance parameter is usually written on the battery introduction page. Pay attention to the selection, and try not to buy more than 100 m Ω cells.

　　When using multiple 18650s in series, you must buy batteries of the same brand and model, or batteries with large internal resistance and low capacity will become a short board.

　　6. Temperature

　　Temperature is a major factor affecting the life of 18650 lithium battery. The higher the temperature is, the faster the battery will age. The higher the temperature is, the greater the damage to the battery interior will be.

　　Lithium battery protection: short circuit protection, overcharge protection, over discharge protection, over-current protection.?

　　Product features

　　Shockproof and waterproof: through the design of shockproof structure filled in the fireproof PC shell, the requirements of high safety and high reliability are met;

　　Low temperature operation: Low temperature electric core is used to ensure operation at - 40 ℃.

　　Reliable connection: gold plated finger connector is used for quick, safe and reliable connection;

　　The battery pack is safe and equipped with a temperature probe, which can upload temperature information to the upper computer;

　　I2C communication of battery pack, which can upload battery voltage, current, capacity and other parameters to the upper computer;

　　The battery pack has a high cycle life, which conforms to the value concept of low carbon, energy conservation and environmental protection;

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