High-Capacity 21700 Lithium-Ion Cell for Global Buyers
If you are sourcing 21700 lithium-ion cells for battery packs, power tools, e-mobility, energy storage, or industrial applications, the FEB 21700G/68E is a product worth evaluating.
Manufactured by Jiangxi Far East Battery Co., Ltd. / Jiangxi Far East LIB Co., Ltd. (FEB), this 6500mAh 3.6V 21700 cell combines high capacity, low internal resistance, stable discharge performance, and safety-tested construction. With a nominal energy of 23.4Wh, it is designed for buyers who need a reliable high-capacity 21700 battery for commercial battery pack production.
Whether you are comparing 21700 battery suppliers, developing a new battery pack, or looking for a consistent long-term cell source, the FEB 21700G/68E offers the performance and quality that global buyers expect.
Why Choose the FEB 21700G/68E?
1. High Capacity: 6500mAh in a Standard 21700 Format
The 21700G/68E delivers a nominal capacity of 6500mAh and a minimum capacity of 6500mAh. This gives battery pack designers more energy per cell, helping reduce the number of cells required in some configurations and supporting more compact, lighter battery pack designs.
2. Stable 3.6V Nominal Voltage
With a 3.6V nominal voltage, 4.2V charge limit, and 2.5V discharge cutoff, this cell is compatible with standard lithium-ion battery pack designs. The nominal energy is 23.4Wh, making it suitable for a wide range of rechargeable applications.
3. Low Internal Resistance: ≤19mΩ
The cell features AC internal resistance of ≤19mΩ at 1000Hz. Low internal resistance helps reduce heat generation and voltage drop under load, which is important for high-current battery packs and applications requiring stable power delivery.
4. Up to 2C Continuous Discharge
Under suitable temperature conditions, the 21700G/68E supports a maximum continuous discharge current of up to 2C (13,000mA) in the 0°C to 35°C cell surface temperature range. At higher temperatures, the continuous discharge current is derated for safety and longevity.
5. Fast Charging Capability
The cell supports a maximum continuous charge current of up to 0.7C (4550mA) in the 15°C to 45°C range. Standard charging is 0.5C (3250mA) to 4.2V with a 0.02C (130mA) cutoff in CCCV mode.
6. Wide Operating Temperature Range
The 21700G/68E is designed for demanding environments:
- Charging ambient temperature: 0°C to 45°C
- Discharging ambient temperature: -20°C to 60°C
- Cell surface temperature: 0°C to 60°C during charge; -20°C to 70°C during discharge
This wide temperature tolerance makes it suitable for outdoor equipment, industrial devices, and battery packs used in varied climates.
7. Safety-Tested Design
The cell is designed to meet strict safety standards. Safety tests include:
- Overcharge
- Over-discharge
- External short circuit
- Drop
- Heating
- Seawater immersion
- Low pressure
- Temperature cycling
The acceptance criteria for these tests are typically no explosion, no fire, and no leakage, depending on the test item. This gives battery pack manufacturers greater confidence when integrating the cell into end products.
8. Traceable Barcode and Clear Marking
Each cell is marked with a traceable barcode and key information, including model, capacity, voltage, and energy. The standard sleeve color is yellow, making it easy to identify during production and quality control.
9. Export-Ready Packaging
The FEB 21700G/68E is supplied in professional export packaging:
- Inner box: 10 × 10 = 100pcs
- Outer carton: 2 × 100 = 200pcs
- Pallet: 80 cartons = 16,000pcs
- Corner protectors: 8 pieces per pallet
- Stretch film: no less than 3 layers
- PP strapping and top pressure protection
This packaging is designed to reduce transport damage and support efficient warehouse handling.
Key Specifications of the FEB 21700G/68E
| Item | Specification |
|---|---|
| Model | 21700G/68E |
| Cell Type | Lithium-ion rechargeable cell |
| Nominal Capacity | 6500mAh |
| Minimum Capacity | 6500mAh |
| Nominal Voltage | 3.6V |
| Charge Limit Voltage | 4.2V |
| Discharge Cutoff Voltage | 2.5V |
| Nominal Energy | 23.4Wh |
| Internal Resistance | ≤19mΩ (AC, 1000Hz) |
| Recommended Charge Current | 0.5C (3250mA) |
| Recommended Discharge Current | 0.2C (1300mA) |
| Standard Charge | 0.5C to 4.2V, CCCV, 0.02C cutoff |
| Standard Discharge | 1C (6500mA) to 2.5V |
| Max Continuous Charge | Up to 0.7C (4550mA) at 15–45°C |
| Max Continuous Discharge | Up to 2C (13,000mA) at 0–35°C |
| Diameter | 21.65 ± 0.2mm |
| Height | 70.95 ± 0.2mm |
| Weight | ≤75g |
| Sleeve Color | Yellow |
| Factory Shipping Voltage | 3.5V–3.7V |
Discharge Performance You Can Count On
The FEB 21700G/68E delivers strong discharge efficiency at different rates:
| Discharge Rate | Current | Discharge Efficiency |
|---|---|---|
| 0.2C | 1300mA | 100% |
| 0.5C | 3250mA | ≥95% |
| 1C | 6500mA | ≥93% |
| 2C | 13000mA | ≥90% |
At 25°C, discharge efficiency is 100%. At 55°C, it remains ≥95% of initial capacity, showing stable performance in higher-temperature environments.
These characteristics make the cell suitable for applications that require consistent capacity delivery, such as power tools, e-bikes, energy storage systems, robotics, and portable power stations.
Temperature and Current Limits
Maximum Continuous Charge Current by Cell Surface Temperature
| Cell Surface Temperature | Max Continuous Charge Current |
|---|---|
| 60°C > T ≥ 45°C | 0.5C (3250mA) |
| 45°C > T ≥ 15°C | 0.7C (4550mA) |
| 15°C > T ≥ 5°C | 0.5C (3250mA) |
| 5°C > T ≥ 0°C | 0.1C (650mA) |
Maximum Continuous Discharge Current by Cell Surface Temperature
| Cell Surface Temperature | Max Continuous Discharge Current |
|---|---|
| 70°C > T ≥ 45°C | 0.5C (3250mA) |
| 45°C > T ≥ 35°C | 1C (6500mA) |
| 35°C > T ≥ 0°C | 2C (13000mA) |
| 0°C > T ≥ -20°C | 1C (6500mA) |
For safe and reliable operation, battery pack designers should follow these temperature-based current limits and include proper protection circuits.
Battery Pack Design Notes for Buyers
The FEB 21700G/68E is suitable for battery pack integration, but correct design is essential. Recommended guidelines include:
- Use cells of the same grade, same batch, and same charge state.
- Before assembly, check voltage and internal resistance.
- For series/parallel assembly, keep voltage difference within 20mV and internal resistance difference within 6mΩ.
- Do not solder cells directly. Use resistance welding or laser welding.
- Keep cells away from heating components.
- Use overcharge, over-discharge, and overcurrent protection.
- Ensure the temperature difference inside the battery pack is ≤5°C during discharge.
- Do not use damaged, deformed, or leaking cells.
These guidelines help maximize pack performance, safety, and service life.
Applications of the FEB 21700G/68E
The FEB 21700G/68E is a strong candidate for:
- Lithium-ion battery packs
- Power tools
- E-bikes and e-scooters
- Energy storage systems
- Portable power stations
- Robotics and AGVs
- Industrial equipment
- Backup power systems
- High-capacity 21700 battery projects
If your product requires a 6500mAh 21700 cell with stable output and low internal resistance, this model is worth evaluating.
Storage and Handling
- Store in a dry environment: 0–50% RH, no corrosive gas.
- Avoid pressure and condensation on the cell surface.
- Short-term storage: -20°C to +40°C, less than 3 months.
- Long-term storage: -20°C to +20°C, 3 to 12 months.
- For storage over 3 months, maintain voltage at 3.5V–3.7V.
- Recharge cells below 3.5V at 0.5C every 3 months during the shelf life.
Always follow local regulations for transport, storage, and recycling of lithium-ion cells.
FAQ: FEB 21700G/68E Lithium-Ion Cell
What is the capacity of the FEB 21700G/68E?
The nominal and minimum capacity is 6500mAh.
What is the nominal voltage?
The nominal voltage is 3.6V. The charge limit voltage is 4.2V, and the discharge cutoff voltage is 2.5V.
What is the maximum discharge current?
The cell supports up to 2C (13,000mA) continuous discharge in the 0–35°C cell surface temperature range. At higher temperatures, the current should be derated according to the specification.
What is the internal resistance?
The AC internal resistance is ≤19mΩ at 1000Hz.
Is this cell suitable for battery packs?
Yes. It is designed for battery pack applications. Buyers should follow FEB’s recommendations for cell matching, welding, protection circuits, and thermal management.
What is the packaging quantity?
- Inner box: 100pcs
- Outer carton: 200pcs
- Pallet: 16,000pcs
Can I request samples or wholesale pricing?
Yes. Please contact us to request samples, wholesale pricing, or the full specification sheet for the FEB 21700G/68E.
Request FEB 21700G/68E Cells Today
The FEB 21700G/68E 6500mAh 3.6V lithium-ion cell is designed for buyers who need high capacity, low internal resistance, reliable discharge performance, and safety-tested construction. With export-ready packaging and clear traceability, it is a practical choice for battery pack manufacturers, distributors, and OEM/ODM customers worldwide.
Contact us today to request a quote, sample, or full specification sheet for the FEB 21700G/68E.
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