: It is a Lithium Thionyl Chloride (Li-SOCl2) battery, often sold under brands like Cellonic at Subtel . Pros :
: In some advanced math materials, 27216x appears as part of an equation (e.g., 27216x
: It features a proprietary connector; it is not a standard AA or AAA battery. : It is a Lithium Thionyl Chloride (Li-SOCl2)
: Premium price compared to standard consumer batteries due to the specialized chemistry and connector. : It features a proprietary connector