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Samsung 21700 Lithium Rechargeable Cell: 3.6V 5000mAh (18Wh, INR21700-50S) - UN38.3 Passed -

Your Price: We do not sell single cells.

Product ID # 13174
Part Number:


Battery SamSung 21700 INR21700-50S Cylindrical Li-Ion Cell
Standard Discharge Capacity Typ. 5000mAh
-Charge: 0.5C(2500mA), 4.2V, 0.05C(250mA) cut off @ RT
-Discharge: 0.2C(1000mA), 2.5V cutoff @ RT
Rated Discharge Capacity Min: 4800mAh
-Charge: 1.2C(6000mA), 4.2V, 0.02C(100mA) cut off @ RT
-Discharge: 2C(10000mA), 2.5V cutoff @ RT
Charge Voltage 4.2V
Nominal Voltage 3.6V
Standard Charge CCCV, 2.5A, 4.20 V, 250mA cut-off
Rated charge CCCV, 6A, 4.20 V, 100mA cut-off
Charging time Standard charge : 150min / 250mA cut-off(@ RT)
Rated charge: 100min / 100mA cut-off(@ RT)
Max. continuous discharge
(Surface temperature)
25A(Without temperature cut)
45A(With 80℃ temperature cut)
Max. charge current 10A (for step charge)
6A (continuous charge)
Discharge Cut-off Voltage 2.5V (End of discharge)
Cycle Life 1)Capacity ≥ 2,940mAh @ after 250cycles; (60% of the standard capacity @ RT)
-Charge : 6A, 4.20V, CCCV 100mA cut-off @ RT
-Discharge: 25A , 2.5V cut-off @ RT
2)Capacity ≥ 2,940mAh @ after 100cycles; (60% of the standard capacity @ RT)
-Charge : 6A, 4.20V, CCCV 100mA cut-off @ RT
-Discharge: 45A, 2.5V cut-off
(80℃ cut-off, re-discharge release < 50℃) @ RT
Retention characteristics Capacity recovery(after the storage) ≥ 4,320 mAh
(90% of the rated capacity @ RT)
- Charge : 6A, 4.20V, CCCV 100mA cut-off @ RT
- Storage : 30 days (@ 60℃)
- Discharge : 10A , 2.5V cut-off @ RT
Cell Weight 72.0g max
Cell Dimension
  • Height: Max. 70.62mm
  • Diameter: Max. 21.25mm
Operating temperature
  • Charge : 0 ~ 60℃
  • Discharge: -20 ~ 60℃
Operating Temperature (surface temperature)
  • Charge : 0 ~ 60℃ (recommended recharge release < 45℃)
  • Discharge: -20 ~ 80℃ (must re-discharge release < 60℃)

Discharge OTP(over temp. protection) should not be over 80℃ of temperature. Protection set should be based on the location of the cell surface with the highest temp increase part of the battery pack.
Operating temperature
(For safety certificate)
  • Charge : -10 to 60℃
Recovery 90% after
  • 1 year: 0 ~ 25℃
  • 3 months: 0 ~ 45℃
  • 1 month: 0 ~ 60℃
If Cell is kept as ex-factory status (30% of charge), the capacity recovery rate shall be more than 90%.

Please download the Specification here


  • Li-Ion Batteries may explode if charged or discharged improperly.
  • Please possess knowledge of electronics and understand how to handle Li-ion battery. 
  • Please always use a protection circuit board (PCB) to keep battery from overcharged and over-discharged
  • Never solder directly onto the Li-ion battery as overheat might damage the battery. If you are making a pack or need to solder batteries together, you need to get battery with tabs on it. You will solder to tabs instead directly onto the battery.
  • Please read more safety warning about Li-ion battery
  • California residents: Warning: Cancer and Reproductive Harm - See Prop 65 Warnings

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