Due to the improvement of the level of modern battery production technology, the size of the polymer lithium battery will be different because of different manufacturers or the same manufacturer because of the actual use of the battery, some parameters will be different, such as size, shape and so on.

　　Polymer lithium batteries generally refer to lithium batteries with soft aluminum film packaging, such as steel shell batteries or square aluminum shell lithium batteries such as 18650 lithium batteries are not included. From the invention of polymer lithium battery to the present, it has included three types of low-temperature lithium battery, high-rate lithium battery and medium-high temperature lithium battery. As the strength of the lithium battery industry brand manufacturers, in the polymer lithium battery after years of research and development and production, obtained a number of innovative technology patents, lithium battery quality is one of the industry leaders.

　　Generally, the voltage of a lithium battery cell is as follows:

　　Lithium battery nominal voltage (operating voltage) : 3.7V

　　Maximum charging voltage: 4.2V

　　Discharge cut-off voltage: 2.75V

　　Optimal storage voltage: 3.8V 0.1V (45%~60% capacity charged state)

　　Current industry shipping voltage: 3.8V ~3.9V

　　Overcharge protection voltage: 4.28V or less

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