(1) The main reason is that the cost is higher, because it can be planned according to the needs of customers, and the R&D cost here has to be included. In addition, the variety of shapes and varieties have led to the correct and wrong standard parts of various tooling and fixtures during the production process, and correspondingly increased costs.

(2) The polymer battery itself has poor versatility, which is also brought about by sensitive planning. It is often necessary to plan one for customers from scratch for the difference of 1mm.

(3) If it is broken, it will be completely discarded, and protection circuit control is required. Overcharge or overdischarge will damage the reversibility of the internal chemical substances of the battery, which will seriously affect the battery life.

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

For drone battery maintenance tips like drone battery not charging you can revirw our later articles.