High-Drain 21700 Cell – INR21700 RS50 Fast-Charge Battery
If you are sourcing a reliable high-drain 21700 cell for power tools, e-bikes, drones, or energy storage systems, the INR21700 RS50 deserves a place on your shortlist. Manufactured by Jiangsu Reliance Energy Tech. Co., Ltd., this 21700 lithium-ion cell combines a 4950mAh minimum capacity, 70A continuous discharge, and 15A fast charging in a standard 21700 format.
We currently carry large stock of the INR21700-RS50 and offer competitive wholesale pricing for overseas buyers, distributors, and OEM battery pack manufacturers. If you need bulk 21700 cells with stable supply and responsive support, contact us for a quotation.
Why the INR21700 RS50 Stands Out
The INR21700-RS50 is designed for applications that demand both high capacity and high current. Key highlights include:
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4950mAh minimum capacity – 5000mAh-class 21700 cell
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70A maximum continuous discharge with 80°C temperature cut-off
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15A maximum continuous charge
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15-minute stepwise fast charge to about 80% SOC
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Wide discharge temperature range: -40°C to 80°C
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Low ACIR: ≤4.0mΩ at 1kHz
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Cycle life: up to 1,500 cycles at 90% DOD
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Tested to UN38.3, IEC62133, and UL1642 protocols
For buyers searching for a 70A 21700 cell, a fast-charge 21700 battery, or a high rate lithium battery for demanding packs, the INR21700-RS50 is a strong fit.
INR21700 RS50 Specifications
| Item | Specification |
|---|---|
| Model | INR21700-RS50 |
| Cell Type | Rechargeable lithium-ion cell |
| Nominal Voltage | 3.6V |
| Charge Cut-off Voltage | 4.2V |
| Discharge Cut-off Voltage | 2.5V |
| Minimum Capacity | 4950mAh |
| Standard Charge Current | 2.5A |
| Standard Discharge Current | 1.0A |
| Rate Charge | 8A |
| Max Continuous Charge Current | 15A |
| Max Continuous Discharge Current | 70A (with 80°C cut-off) |
| ACIR | ≤4.0mΩ at 1kHz |
| Weight | ≤67.0g |
| Max Diameter | 21.35mm |
| Max Height | 70.30mm |
| Charge Temperature | 0°C to 60°C |
| Discharge Temperature | -40°C to 80°C |
| Factory Shipping Voltage | 3.46V to 3.52V |
This makes the INR21700-RS50 a versatile 3.6V 21700 cell for high-power battery pack designs.
Discharge Performance: Up to 70A Continuous Discharge
The INR21700-RS50 is built for high-rate discharge. In rate discharge testing, the cell is charged at 1.6C (8A) to 4.2V with 100mA cut-off, then discharged at different currents to 2.5V or 80°C cut-off.
| Discharge Current | Relative Capacity |
|---|---|
| 1.0A | 100% |
| 10A | ≥96% |
| 20A | ≥96% |
| 30A | ≥95% |
| 40A | ≥95% |
| 50A | ≥90% |
| 60A | ≥60% |
| 70A | ≥50% |
This discharge profile makes the INR21700-RS50 suitable for 21700 for power tools, 21700 for e-bike, 21700 for drone, and other high-drain applications where current delivery matters.
Fast Charging and Wide Temperature Operation
The INR21700-RS50 supports multiple charging modes:
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Standard charge: 0.5C (2.5A) CCCV to 4.2V, 100mA cut-off
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Rate charge: 1.6C (8A) CCCV to 4.2V, 100mA cut-off
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Fast charge: 3C (15A) CCCV to 4.2V, 100mA cut-off
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15-minute stepwise fast charge: 10A/16A/20A/10A to 4.0Ah (about 80% SOC), with 4.2V protection voltage and 55°C protection temperature
For discharge, the cell operates from -40°C to 80°C. Relative capacity at different temperatures, using 40A discharge at 25°C as 100%, is shown below:
| Discharge Temperature | Discharge Current | Relative Capacity |
|---|---|---|
| -40°C | 5A | 85% |
| -20°C | 40A | 90% |
| -10°C | 40A | 92% |
| 0°C | 40A | 95% |
| 25°C | 40A | 100% |
| 45°C | 40A | 90% |
Important: Charging should be done within 0°C to 60°C. Do not charge below 0°C.
Cycle Life and Long-Term Reliability
The INR21700-RS50 is designed for repeated high-rate cycling. Capacity retention remains at ≥80% under the following test conditions:
| Test Condition | Cycle Life | Capacity Retention |
|---|---|---|
| 8A charge / 40A discharge | 500 cycles | ≥80% |
| 15A charge / 30A discharge | 500 cycles | ≥80% |
| 8A charge / 10A discharge, 90% DOD | 1000 cycles | ≥80% |
| 2A charge / 4A discharge, 90% DOD | 1500 cycles | ≥80% |
This cycle performance makes the cell suitable for battery packs used in tools, mobility products, and energy storage systems.
Mechanical and Safety Testing
The INR21700-RS50 is tested according to key international standards, including UN38.3, IEC62133, and UL1642 test protocols.
| Test | Standard | Result |
|---|---|---|
| Vibration | UN38.3 | No leakage, voltage drop <10% |
| Free Drop | IEC62133 | No fire, no explosion |
| Crush | UL1642 | No fire, no explosion |
| 2C 6V Overcharge | IEC62133 | No fire, no explosion |
| Forced Discharge | IEC62133 | No fire, no explosion |
| Short Circuit | UL1642 | No fire, no explosion |
| Heating Test | UL1642 | No fire, no explosion |
These tests provide additional confidence for overseas buyers integrating the cell into commercial battery packs.
Recommended Applications
The INR21700-RS50 is suitable for a wide range of high-power and high-capacity battery pack projects:
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Power tools and cordless tools
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E-bikes, e-scooters, and electric motorcycles
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Drones and UAVs
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Energy storage systems and portable power stations
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Vacuum cleaners and garden tools
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Robotics and AGV systems
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OEM/ODM battery pack assembly
If you are looking for 21700 for power tools, 21700 for e-bike, 21700 for energy storage, or 21700 for drone applications, this cell offers a strong combination of capacity, discharge rate, and fast-charge capability.
Supply Advantages: Bulk Stock and Competitive Pricing
As a supplier of INR21700-RS50 cells, we understand that overseas buyers need more than a good datasheet. They need stable supply, competitive pricing, and fast communication.
We offer:
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Large stock of INR21700-RS50 cells
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Competitive wholesale pricing for bulk orders
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Attractive 21700 battery price for distributors and pack manufacturers
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Fast quotation and responsive sales support
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Stable supply for long-term projects
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Technical data and specification support
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Support for bulk 21700 cells and OEM battery pack production
Whether you are comparing 21700 battery wholesale offers or searching for a dependable 21700 cell supplier, our team can help you secure the right cells at the right price.
Why Buy INR21700-RS50 From Us?
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High-drain performance: up to 70A continuous discharge
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Fast charging: up to 15A continuous charge
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Capacity: 4950mAh minimum, 5000mAh-class
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Wide discharge temperature: -40°C to 80°C
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Long cycle life: up to 1,500 cycles at 90% DOD
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Tested to UN38.3, IEC62133, and UL1642 protocols
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Large stock and competitive wholesale pricing
FAQ
What is the INR21700 RS50?
The INR21700-RS50 is a rechargeable high-drain 21700 lithium-ion cell with 3.6V nominal voltage, 4950mAh minimum capacity, 70A maximum continuous discharge, and 15A maximum continuous charge.
Can the INR21700 RS50 support fast charging?
Yes. It supports 2.5A standard charge, 8A rate charge, and 15A fast charge. It also supports a 15-minute stepwise fast charge to 4.0Ah, about 80% SOC, with 4.2V protection voltage and 55°C protection temperature.
What applications is this fast-charge 21700 battery suitable for?
It is suitable for power tools, e-bikes, e-scooters, drones/UAVs, energy storage systems, vacuum cleaners, robotics, AGVs, and OEM battery packs.
What is the cycle life?
Cycle life depends on the test condition:
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8A charge / 40A discharge: 500 cycles, ≥80% capacity retention
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15A charge / 30A discharge: 500 cycles, ≥80% capacity retention
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8A charge / 10A discharge, 90% DOD: 1000 cycles, ≥80% capacity retention
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2A charge / 4A discharge, 90% DOD: 1500 cycles, ≥80% capacity retention
What is the operating temperature?
Charging: 0°C to 60°C.
Discharging: -40°C to 80°C.
Do not charge below 0°C.
Do you offer bulk stock and wholesale pricing?
Yes. We carry large stock of INR21700-RS50 cells and offer competitive wholesale pricing for bulk orders. Contact us with your target quantity, application, and destination for a quick quotation.
Request a Quote for INR21700 RS50 21700 Battery
Looking for a reliable INR21700 RS50 high-drain 21700 cell supplier with large stock and competitive pricing?
Contact us today for wholesale pricing, bulk order support, and technical information. We are ready to help you secure high-quality 21700 lithium-ion cells for your next battery pack project.
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