(1) The main reason is that the cost is relatively high, because it can be planned according to customer needs, and the research and development cost here needs to be included. Moreover, due to the diverse appearance and variety of types, various fixtures and fixtures are used to correct and standardize parts during the production process, which also adds corresponding costs.

　　(2) Polymer batteries themselves have poor versatility, which is also due to sensitive planning. Often, in order to achieve such a 1mm difference, customers need to plan a new one from scratch.

　　(3) If it breaks down, it will be completely discarded, and it is necessary to protect the circuit control. Overcharging or discharging can damage the reversibility of the chemical substances inside the battery, seriously affecting its lifespan.

　　(4) The lifespan is shorter than 18650 because of the use of different plans and materials, some have liquid inside, while others are dry or colloidal, and their performance is not as good as 18650 cylindrical batteries when discharged at high currents.

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