21700 5000 mAh cell BAK N21700CG-50E 5000mAh 3.6V 21700 Li-ion Battery Cell | 15A 3C High Discharge | 5A Max Charge | 4.2V Rechargeable Lithium Battery in pakistan

BAK N21700CG-50E 5000mAh 3.6V 21700 Li-ion Battery Cell

The BAK N21700CG-50E is a high-quality 21700 cylindrical lithium-ion battery cell manufactured by BAK Battery. It is designed for applications requiring high capacity, reliable performance, and good discharge capability.

According to the BAK official datasheet, the cell has a typical capacity of 5000mAh, a nominal voltage of 3.6V, and a 3C maximum discharge capability. The cell uses a Hi-Ni chemistry and is suitable for applications such as E-bikes, E-motorcycles, smart devices, battery packs, and energy-storage applications.

Technical Specifications

- Brand: BAK

- Model: N21700CG-50E

- Cell Type: Cylindrical Lithium-Ion

- Size: 21700

- Chemistry: Hi-Ni

- Typical Capacity: 5000mAh

- Nominal Voltage: 3.6V

- Nominal Energy: Approximately 18Wh

- Minimum Capacity: 4900mAh

- Maximum Charge Voltage: 4.20V

- Standard Charge Current: 0.5C

- Maximum Charge Current: 1C

- Standard Discharge Current: 0.2C

- Maximum Discharge Current: 3C

- Discharge Cut-off Voltage: 2.50V

- Internal Resistance: Approximately 13mΩ

- Weight: Approximately 67g

- Diameter: 21.25 ± 0.15mm

- Height: 70.50 ± 0.25mm

- Cell Format: Flat-top

- Protection Circuit: None / unprotected

- Charge Temperature: 0°C to 55°C

- Discharge Temperature: -20°C to 70°C

Charging Specifications

The BAK N21700CG-50E uses a CC-CV (Constant Current–Constant Voltage) lithium-ion charging method.

Standard Charging

Standard charging current: 0.5C

For a 5000mAh cell:

0.5C = 2.5A

The charging voltage is limited to:

4.20V

Therefore, a standard charging profile is approximately:

2.5A CC → 4.20V CV → charge current decreases until termination

The manufacturer's datasheet specifies 1C as the maximum charge current. For a 5000mAh cell:

1C = 5A

The 1C maximum charge specification should not be confused with the standard charging rate and should be used according to the manufacturer's operating conditions.

Discharge Specifications

The BAK N21700CG-50E has a 3C maximum discharge rating.

Based on the 5000mAh capacity:

Discharge Rate| Approx. Current

0.2C Standard| 1.0A

0.5C| 2.5A

1C| 5A

2C| 10A

3C Maximum| 15A

The manufacturer's rate-discharge characteristics include 0.2C, 0.5C, 1C, 2C and 3C testing.

Maximum specified discharge: approximately 15A (3C).

The discharge cut-off voltage specified by BAK is 2.50V. Do not intentionally discharge the cell below the manufacturer's specified cut-off voltage.

Capacity

The cell is rated at:

Typical capacity: 5000mAh

The BAK datasheet specifies capacity testing at 0.2C.

Approximate energy:

3.6V × 5Ah = 18Wh

The cell therefore provides approximately 18Wh nominal energy.

Internal Resistance

The official BAK datasheet lists approximately:

13mΩ

Low internal resistance helps reduce voltage sag and heat generation during higher-current operation. Actual resistance can vary depending on temperature, state of charge, measurement method, and cell condition.

Temperature Range

Charging

0°C to +55°C

Discharging

-20°C to +70°C

Battery performance can vary significantly with temperature. Charging lithium-ion cells outside the manufacturer's specified temperature range should be avoided.

Dimensions

- Diameter: 21.25 ± 0.15mm

- Height: 70.50 ± 0.25mm

- Weight: approximately 67g

Applications

The BAK N21700CG-50E is suitable for:

- E-bike battery packs

- E-motorcycle battery packs

- Electric mobility applications

- Portable power systems

- DIY lithium-ion battery packs

- Power equipment

- Smart devices

- Energy-storage applications

- High-capacity 21700 battery packs

BAK specifically lists E-motorcycles, E-bikes and smart devices as applications for this cell.

Important Safety Information

This is a bare lithium-ion battery cell and does not include a built-in protection circuit.

When used in a battery pack, use an appropriate BMS (Battery Management System) suitable for the number of cells in series and the required charging/discharging current.

Do not:

- Overcharge above 4.20V

- Deep-discharge below the specified cut-off voltage

- Short-circuit the cell

- Puncture, crush, or damage the cell

- Expose the cell to excessive heat

- Charge outside the specified temperature range

Use a proper lithium-ion charger and appropriate protection circuitry.

Key Specifications

Model: BAK N21700CG-50E

Capacity: 5000mAh typical

Minimum Capacity: 4900mAh

Nominal Voltage: 3.6V

Charge Voltage: 4.20V

Standard Charge: 0.5C / 2.5A

Maximum Charge: 1C / 5A

Standard Discharge: 0.2C / 1A

Maximum Discharge: 3C / 15A

Discharge Cut-off: 2.50V

Internal Resistance: ~13mΩ

Size: 21700

Dimensions: 21.25 × 70.50mm

Weight: ~67g

Chemistry: Hi-Ni Li-ion

Protection: None

Charge Temperature: 0°C to 55°C

Discharge Temperature: -20°C to 70°C

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