The biggest disadvantage of 18650 lithium batteries is that their size is already fixed, making them difficult to position when installed in some laptops or products. Of course, this disadvantage can also be considered an advantage, compared to other polymer lithium batteries that can be customized and can be changed in size. This is a disadvantage. Compared to some products with specified battery specifications, it has become an advantage.

　　18650 lithium batteries are prone to short circuits or explosions, which is also relative to polymer lithium batteries. If compared to ordinary batteries, this disadvantage is not so obvious.

　　The production of 18650 lithium batteries requires protective circuits to prevent the battery from being overcharged and causing discharge. Of course, this is necessary for lithium batteries, and it is also a disadvantage of lithium batteries, because the materials used in lithium batteries are mostly lithium cobalt oxide materials, and lithium cobalt oxide materials cannot discharge large currents, resulting in poor safety.

　　The production conditions of 18650 lithium batteries require high requirements, which undoubtedly increases production costs compared to general battery production.

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