3.6V  Samsung-INR21700-50E Battery


The Samsung INR21700 50E battery comes up with a standard  discharge capacity of 4900mAh, the voltage of 3.6V. The powerful 21700 battery was developed for high discharge currents.Without protective circuit.  This is an absolutely excellent cell for anyone seeking high performance 21700 cells.

HIGHLIGHTS OF Samsung INR21700 40T

Standard discharge capacity: 4900mAh (0.2C discharge)
Rated discharge capacity: 4753mAh (1C discharge)
Charge voltage: 4.2V
Nominal voltage: 3.6V
Charging method: CC-CV
Maximum charge current: 4900mA
Maximum continuous discharge current: 9800mA
Maximum pulse discharge current: 14700mA
Discharge cut-off voltage: 2.5V
Cycle life: 500 cycles to 3802mAh (80%)
Operating temperature: Charge: 0°C ~ 45°C, discharge: -20°C ~ 60°C
Storage temperature: 1 month: -20°C ~ 60°C, 3 months: -20°C ~ 45°C, 1 year: -20°C ~ 23°C

APPLICATION: In addition to industry, applications include power stations or model construction.


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.20.25mm

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

Height : Max.70.80mm


Outline Dimensions of INR21700-50E

Nominal Specification of Samsung-21700-50E

Item Specification
Standard discharge capacity(1C=4,900mA) Min 4,900mAh
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff
- Discharge : 0.2C(980mA), 2.5V cutoff
Rated discharge capacity Min 4,753mAh
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff
- Discharge : 1C(4,900mA), 2.5V cutoff
Nominal voltage 3.6V
Charging Voltage 4.2V
Charging Method CC-CV (constant voltage with limited current)
Charging Current Standard charge: 2,450mA
Charging time Standard charge: 3hours
Max. Charge Current 4,900mA (not for cycle life)
Max. Discharge Current 9,800mA (for continuous discharge)
14,700mA (not for continuous discharge)
Discharge cut-off voltage/End of discharge 2.5V (End of discharge)
Cycle life Capacity ≥ 3,802mAh after 500cycles (80% of the standard capacity )
Charge : 0.5C(2,450mA), 4.2V,CCCV 0.05C(245mA) cut-off
Discharge: 1C(4,900mA), 2.5V cut-off
Recovery characteristics Capacity recovery (after the storage) ≥ 4,278mAh(90% of the Rated Discharge Capacity
Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff
Storage : 30 days
Discharge : 1.0C(4,900mA) 2.50V cut-off
Cell weight 69g max
Cell dimension Height : Max 70.80mm
Diameter : Max. 20.25 mm
Operating temperature(Cell Surface Temperature) Charge : 0 to 45℃
Discharge: -20 to 60℃
Operating Temperature 1 year: -20~23℃
3 months : -20~45°C
1 month : -20~60°C


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 60’C 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 80%.


Standard Charge

This “Standard Charge” means charging the cell with charge current of 0.5C(2,450mA) and constant voltage 4.2V and 0.02C(98mA) 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(980mA) with 2.50V cut-off at 23°C within 1 hour after the Standard charge.

Standard Discharge Capacity≥ 4,900mAh

Rated Discharge Capacity

The rated discharge capacity is the initial discharge capacity of the cell, which is measured with discharge current of 1C(4,900mA) with 2.50V cut-off at 23°C within 1 hour after the Standard charge.

Rated Discharge Capacity≥ 4,753mAh (97% of 4,900mAh)

Initial internal impedance

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

Initial internal impedance≤ 35mΩ

Temperature Dependence of Discharge Capacity

Discharge capacity comparison at each temperature, measured with discharge constant current 1C(4,900mA) and 2.50V cut-off with follow temperature after the standard charging at 23°C.

Charge Temperature Discharge temperature
23°C -10°C 23°C 40°C
Relative Capacity 60% 97% 97%


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 (=4,900mAh) is 100%

Discharge Rate Capabilities

Discharge capacity is measured with the various currents in under table and 2.50V cut-off after the Standard charge at 23°C.

Discharge condition
Current 0.2C (980mA) 1C (4900mA) 2C (9800mA)
Relative Capacity 100% 97% 95%


Percentage as an index of the Standard discharge capacity (=4,900mAh) 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


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USD 2.5-4
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Available in Stock