1. Battery brand

　　Regarding brands, internationally renowned brands such as Sanyo, Samsung, SONY, LG, etc. are currently reliable.

　　Sanyo and LG mainly focus on conventional applications, such as strong flashlights, power banks, and laptop batteries.

　　SONY is professional, specializing in high power and current. Taking VTC4 as an example, with a discharge current of up to 30A, it can easily handle electronic cigarettes, toy aircraft models, etc.

　　2. Nominal capacity

　　The nominal capacity of an 18650 battery is related to its endurance, expressed in "mAh". The higher the capacity, the stronger the endurance. For example, a 2800mAh battery can discharge continuously for 2 hours at a current of 1.4A.

　　At present, the phenomenon of virtual battery capacity is very serious. The vast majority of domestic 18650 lithium batteries with a capacity exceeding 3000 are virtual. Currently, only Panasonic has the highest capacity and can buy 3400mAH, while domestic batteries generally have a capacity between 2200-2800mAH. At present, apart from buying large battery cells to ensure that there is no or very little virtual capacity, ordinary users can only use a discharge meter to test the capacity.

　　In addition to false labeling, it is also important to be careful not to purchase disassembled batteries when purchasing. Disassembled batteries are usually removed from obsolete battery packs and are nearing retirement, so there is no need to waste money~

　　3. Continuous discharge current (CDR)

　　The continuous discharge capacity is represented by the number C, and the continuous discharge current=the continuous discharge capacity C number × 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 is 1.4A. If the discharge exceeds 1.4A for a long time, it will seriously affect the battery life and may pose risks such as overheating, combustion, and explosion. The parameter of continuous discharge capacity is usually written on the battery introduction page, and it is important to pay attention to it. Some parameters directly indicate the continuous and maximum continuous discharge current.

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