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25A CYCLE TEST
≥2940mAh after 250 cycles at 25°C.
Charge: 6A CCCV to 4.20V with 100mA cut-off. Discharge: 25A to 2.5V.
(China stocks) INR21700 5000mAh 3.6V li-ion battery cell
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(China stocks) INR21700 5000mAh 3.6V li-ion battery cell
- Stock: In Stock
- Model: INR21700-50S
$3.00
500 or more $2.50
1000 or more $2.20
10000 or more $1.80
CYLINDRICAL LITHIUM-ION CELL
SAMSUNG SDI INR21700-50S
High-capacity 21700 rechargeable lithium-ion cell for professionally engineered power-tool and battery-pack applications. A 5000mAh typical capacity combines with a 3.6V nominal voltage and a 25A continuous-discharge specification.
45A discharge is specified only with an 80°C cell-surface temperature cut-off. This is a component cell, not a protected consumer battery.
5000mAh
TYPICAL CAPACITY
3.6V
NOMINAL VOLTAGE
25A
CONTINUOUS DISCHARGE
≤14mΩ
INITIAL AC IMPEDANCE AT 1kHz
PRODUCT OVERVIEW
CAPACITY AND POWER IN A 21700 CELL.
The supplied Samsung SDI specification identifies INR21700-50S as a rechargeable lithium-ion cell manufactured in Korea for power-tool applications. Typical capacity and rated minimum capacity use different charge and discharge test conditions; they should not be treated as interchangeable measurements.
KEY ENGINEERING FEATURES
- 5000mAh typical capacity measured at 1A discharge.
- 4800mAh minimum rated capacity measured at 10A discharge.
- CCCV charging to 4.20V and a 2.5V discharge cut-off.
- Standard 2.5A charge and rated 6A charge profiles.
- Maximum dimensions with sleeve: 21.25mm diameter and 70.62mm height.
Pack-level BMS, electrical protection, temperature monitoring,
cell matching and suitable interconnect design are required.
Do not interpret a cell specification as an approval for a
finished pack or any particular end-use.
TECHNICAL SPECIFICATIONS
COMPLETE CELL DATA, CLEARLY ORGANIZED.
Source: supplied Samsung SDI specification v0.2, September 2020. Unless otherwise specified, standard tests use 23 ± 3°C and humidity below 65%.
| Model / manufacturer | INR21700-50S / Samsung SDI |
|---|---|
| Cell type | Rechargeable lithium-ion, cylindrical 21700 |
| Nominal voltage | 3.6V |
| Typical capacity | 5000mAh; standard charge, 1A discharge to 2.5V |
| Rated capacity | ≥4800mAh; rated charge, 10A discharge to 2.5V |
| Standard charge | CCCV, 2.5A, 4.20V, 250mA cut-off |
| Rated charge | CCCV, 6A, 4.20V, 100mA cut-off |
| Charge time | Standard: 150 min; rated: 100 min at room temperature |
| Maximum charge current | 6A continuous; 10A for step charge only |
| Maximum continuous discharge | 25A without temperature cut-off; 45A with 80°C temperature cut-off |
| Discharge cut-off voltage | 2.5V |
| Initial internal impedance | ≤14mΩ, AC 1kHz after rated charge |
| Manufacturing location | Korea |
|---|---|
| Maximum diameter | 21.25mm with sleeve |
| Maximum height | 70.62mm with sleeve |
| Maximum cell weight | 72.0g |
| Charge ambient temperature | 0 to 60°C |
| Discharge ambient temperature | -20 to 60°C |
| Charge surface temperature | 0 to 60°C; recommended recharge release below 45°C |
| Discharge surface temperature | -20 to 80°C; re-discharge release below 60°C |
| Shipping voltage | 3.440 to 3.490V |
| Storage recovery ≥90% | 1 year: 0-25°C; 3 months: 0-45°C; 1 month: 0-60°C, under ex-factory condition |
| Storage recovery test | ≥4320mAh after 30 days at 60°C under specified test conditions |
| Long-term storage guidance | Dry, low-temperature environment for storage of 3 months or more |
The separate charge-temperature range listed for
safety-certificate testing is not a general charging
recommendation. Follow the normal operating limits above.
Step charging requires a validated profile; 10A is not
a continuous-charge rating.
DISCHARGE CHARACTERISTICS
DISCHARGE RATE AND CAPACITY RETENTION.
The chart below plots specified relative discharge capacity against discharge current. It is derived from section 7.9 of the supplied specification, not from voltage-versus-capacity measurement traces.
| Current | Relative capacity |
|---|---|
| 10A | 100% |
| 15A | 95% |
| 20A | 95% |
| 30A | 93% |
HOW TO READ THIS CHART
Cells are charged using the rated profile: 6A, 4.20V and 100mA cut-off. Discharge capacity is then measured at the listed currents to 2.5V. The reference capacity at 10A and 23°C is 4800mAh, indexed as 100%.
The 30A data point is a specified test condition. It does not increase the 25A continuous rating without temperature cut-off. Actual pack performance depends on temperature, cooling, connections and protection settings.
TEMPERATURE PERFORMANCE
CAPACITY CHANGES WITH TEMPERATURE.
Section 7.6 compares discharge capacity at 10A across five temperatures. Lower temperature reduces available capacity; the chart is not a voltage discharge curve.
| Temperature | Relative capacity |
|---|---|
| -20°C | 80% |
| -10°C | 85% |
| 0°C | 85% |
| 23°C | 100% |
| 60°C | 95% |
| Charge temperature | Relative capacity |
|---|---|
| 0°C | 90% |
| 5°C | 90% |
| 23°C | 100% |
| 45°C | 95% |
| 50°C | 95% |
| 60°C | 90% |
Charge-temperature data are measured by discharging
at 10A to 2.5V at 23°C after charging at the listed
temperatures. These test comparisons are not a
recommendation to operate continuously at temperature
extremes.
CYCLE LIFE AND THERMAL PROTECTION
TEST CONDITIONS MATTER.
45A CYCLE TEST
≥2940mAh after 100 cycles at 25°C.
Charge: 6A CCCV to 4.20V with 100mA cut-off. Discharge: 45A to 2.5V, with 80°C cut-off and re-discharge release below 50°C.
These are capacity thresholds under the specified high-load cycle tests, not guaranteed service life for every application. Pack protection must monitor the hottest cell-surface location. The 45A test uses stricter restart conditions than the general surface-temperature guidance.
MECHANICAL DATA
PLAN FOR CLEARANCE, INSULATION AND HEAT.
| Diameter | ≤21.25mm |
|---|---|
| Height | ≤70.62mm |
| Weight | ≤72.0g |
Use the full mechanical specification when designing holders, cell spacing and connections. Allow suitable insulation, clearance and thermal management. Do not damage the sleeve or positive-terminal insulation during assembly.
ACTUAL PRODUCT PHOTOS
CELL APPEARANCE AND BULK SUPPLY.
Photos are supplied for reference. Labels, batch markings and packaging may differ between supply lots. Confirm the current batch and documentation before ordering.
PACKAGING AND HANDLING
REAL PACKAGING REFERENCES.
SAFE ASSEMBLY AND STORAGE
- Use appropriate BMS, fusing and temperature protection.
- Prevent terminal short circuits and sleeve damage.
- Do not crush, puncture, disassemble or expose cells to heat.
- Do not use damaged cells or mix incompatible cells in a pack.
- Store in a dry, low-temperature environment and follow the manufacturer's handling instructions.
DOCUMENTATION AND ORDER SUPPORT
Contact Docan Energy with quantity, destination and application. Confirm batch details, shipment configuration, transport documentation and applicable after-sales terms before placing an order.
The specification references mechanical and safety test methods; this page does not assert that a particular shipment or finished pack holds certification. The manufacturer's contractual warranty wording is not a Docan retail warranty offer.
CONTACT DOCAN ENERGY
INR21700-50S PROJECT INQUIRY.
Tell us your quantity, destination and intended battery-pack application.