Standardization: 18650 battery is the earliest, most mature, the most stable lithium-ion battery, Japanese manufacturers have accumulated a high level of consistency, a single battery is easy to replace in case of problems.

Safety: 18650 batteries are generally steel casings, which are safer than possible collision problems. And with the continuous improvement of the production technology level of 18650 battery, the safety is also improving. The steel shell lithium battery is prone to explosion, but now the 18650 cell is designed with a safety valve, which can not only release the internal excessive pressure, but also physically disconnect the battery from the outside circuit, which is equivalent to the physical partition of the cell, in order to ensure the safety of other battery pack cells.

But other batteries also have certain advantages, such as the relative safety of lithium-polymer batteries, high energy density, low packaging film strength, do not explode or, worst of all, burn. It can be customized, but the corresponding research and development cost is increased, and the universality is reduced.