4.2V  Samsung-INR21700-50G Lithium Cell


The Samsung INR21700 50G  battery comes up with a MAX discharge current of 14550mA, the charging voltage of 4.2V .

This is an absolutely excellent cell for anyone seeking high performance 21700 cells.

HIGHLIGHTS OF Samsung INR21700 50G

Standard discharge Capacity: Min. 4,850mA
Nominal Voltage: 3.63V
Charging Method: CC-CV(constant voltage with limited current)
Max. Discharge Current: 9,700mA(for continuos discharge)
 14,550mA(not for continuos discharge)


Do not incinerate;
Do not disassemble;
Do not short positive and negative contacts;
Do not expose to heat;
Do not completely discharge;
Do not use force to install a li-ion battery;
Use only high quality battery charger;
Charge fully before first use;
Store in cold and dry place at approximately nominal voltage


There shall be no such defects as deep scratch, crack, rust, discoloration or leakage, which may adversely affect the commercial value of the cell.
Diameter : Max. 21.22 mm

Diameter is defined as the largest data value measured on the “A” area of a cylindrical cell.

Height :Max. 70.30 mm


Nominal Specification of Samsung-21700-50G

Item Specification
Standard discharge capacity Min. 4,850mAh
Charge: 0.33C(1600mA),4.2V, 0.025C(121mA) cutoff
Discharge: 0.2C(800mA), 2.5V cut-off
Charging Voltage 4.2V(1C=4850mA)
Nominal Voltage 3.63V
Charging Method CC-CV (constant voltage with limited current)
Charging time 4hours
Max. Charge Current 1C (4850mA)
Max. Discharge Current 9,700mA (for continuous discharge)
14550mA (not for continuous discharge)
Discharge cut-off voltage/End of discharge 2.5V
Cycle life Capacity ≥ 3,880mAh after 1,000cycles (80% of the standard capacity )
- Charge : 0.33C(1,600mA), 4.2V, CCCV 0.05C(242.5mA) cut-off
Discharge: 1C(4,850mA), 2.5V cut-off
Cell weight Max. 69.5g
Cell dimension Max. 70.15mm
Max. 21.10mm
Operating temperature( Cell surface temperature) Charge : 0 to 50℃
Discharge: -20 to 60℃
Operating temperature(Ambient) Charge : 0 to 45℃
Discharge: -20 to 60℃
Storage Temperature 1 year : -20~23°C
3 months : 0~45℃
1 month : 0~60℃


1.Protection function of the battery pack should be set within the specified charge, discharge and temperature range in the Cell Specification.

2. Discharge OTP(over temp. protection) should not be over 80℃ of the cell surface temperature. Protection set should be based on the location of the cell surface with the  highest temp increase part of the battery pack.

3.If the cell is kept as ex-factory status (30% of charge), the capacity recovery rate is more than 90%.


Standard Charge

This “Standard Charge” means charging the cell CCCV with charge current of 0.33C (1,600mA) and constant voltage 4.2V and 0.025C(121mA) cut-off in CV mode at 23°C.

Standard Discharge Capacity

The standard discharge capacity is the initial discharge capacity of the cell, which is measured with discharge current of 0.2C (970mA) wh 2.50V cut-off at 23°C within 1 hour after the Standard charge.

Standard Discharge Capacit y ≥ 4,850mAh

Initial internal impedance

Initial internal impedance measured at AC 1kHz after Standard charge.

Initial internal impedance 14.0±5.0mΩ

Temperature Dependence of Discharge Capacity

Discharge capacity comparison at each temperature, measured with discharge constant current 0.2C(970mA) and 2.5V cut-off with follow temperature after the standard charging at 25°C.

Charge temperature Discharge temperature
25℃ -20℃ -10℃ 0℃ 25℃ 45℃ 60℃
Cut-off voltage 2.0V 2.5V 2.5V 2.5V 2.5V 2.5V
Relative capacity 70% 75% 85% 100% 100% 95%


If charge temperature and discharge temperature is not the same, the interval for temperature change is 2 hours. Percentage as an index of the Standard discharge capacity (=4,850mAh) is 100%

Temperature Dependence of Charge Capacity

Capacity comparison at each temperature, measured with discharge constant current 0.2C(970mA)and 2.5V cut-off at 25℃ after the standard charge is as follow temperature.

Charge temperature Discharge temperature
0℃ 25℃ 45℃ 25℃
Relative Capacity 90% 100% 100%


If charge temperature and discharge temperature is not the same, the interval for temperature change is 3 hours. Percentage as an index of the Standard discharge capacity (=4,850mAh) is 100%.

How to Custom 18650 Battery Pack

We have the unique ability to develop custom 18650 battery pack to fit your needs. Our expert team of chemists, engineers, and manufacturers who use proven chemistry and production methods that will get from spec to production fast. Slim, flexible, more powerful.


  • Custom Voltage Range: 3V ~ 120V
  • Custom Discharge Current: 0.2C ~ 120C (0.01A-1000A)

  • Custom BMS: Size, Features, Communication, Cut-off, Temperature
  • Custom Battery Size: Starting 0.5mm Thickness
  • Battery Temperature from -40°C–85°C
  • Custom Connector: JST/Molex/Hirose/Anderson/TE/Amphenol  Etc


  • Custom 18650 Battery Pack, MOQ 100 pcs
  • Custom Samples as fast as 3 Days
  • Strict Quality Control, No Safety Concerns Ever
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custom lithium battery packs collection

custom lithium battery packs collection


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