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Standard charge method At 25 ± 2 oC, the cell is charged to 4.2 V under 0.5 C (1275 mA) constant current, then charged under 4.2 V constant voltage until the current tapers to 0.01C (26 mA).  25 ± 2 ;0.5 C 1275 mA;4.2 V; 4.2 V ;0.01 C 26 mA .Standard discharge method. At 25 ± 2 oC, the cell is discharged to 2.75 V under 1 C (2550 mA) constant current.  25 ± 2 oC 1C.2550 mA. 2.75 V. Nominal capacity.The cell nominal capacity, signed as Cap and using mAh as unit, is obtained as per standard charge followed by standard discharge

Cell shall be charged by current 0.5C to 3.6V,then kept at this voltage until the current is less than 0.05C at 25±2 stored 30 minutes,then cell shall be discharged by current 0.5C to cut-off voltage 2.2V;After stored for 30 minutes.tests shall be continued for 2000 times.

3.7V NMC or NCM 18650 Bak Lithium Ion Battery Cell is the most efficient battery that runs for high energy life cycle.It is the predominant battery type used in portable consumer electronics and electric vehicles. It also sees significant use for grid-scale energy storage and military and aerospace applications.

Under optimal conditions, a 3.7V lithium-ion cell can last between two to three years or about 500 charge cycles. However, real-world usage often leads to shorter lifespans due to improper charging practices, extreme temperature exposure, and high-drain usage.