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INR21700-RS50 5000mAh 70A High-Drain Tabless Lithium-ion Cell for Drone Power Tools
Product Overview
The INR21700-RS50 is a cutting-edge, high-drain cylindrical lithium-ion cell manufactured by Reliance (Jiangsu Reliance Energy Tech. Co., Ltd.). Utilizing an advanced full-tab (tabless) structural design, this cell achieves an ultra-low AC Internal Resistance (≤ 4.0mΩ).
This innovative design significantly minimizes internal heat generation during heavy loads, allowing the cell to support an extraordinary 70A maximum continuous discharge current (with an 80°C temperature cut-off) and a 15A fast charge capability.
With a nominal voltage of 3.6V and a minimum capacity of 4950mAh, the RS50 delivers an unparalleled balance of high energy density, massive power output, and exceptional low-temperature discharge performance down to -40°C. It serves as the ultimate premium power solution for demanding applications such as professional power tools, electric vehicles, and high-capacity portable power stations.
Technical Specifications
Item
Specification
Model
INR21700-RS50
Nominal Voltage
3.6V
Standard Capacity
Min. 4950mAh (0.2C discharge) (Typical ~5000mAh)
AC Internal Resistance (ACIR)
≤ 4.0mΩ (@ 1kHz, Typical ~3.0mΩ)
End-of-charge Voltage
4.2V
Discharge Cut-off Voltage
2.5V
Standard Charge Current
2.5A (0.5C)
Standard Discharge Current
1.0A (0.2C)
Rate Charge Current
8.0A (1.6C)
Max. Continuous Charge Current
15A (3C Fast Charge)
Max. Continuous Discharge Current
70A (With 80°C surface temperature cut-off protection)
Cell Dimension
Max. Diameter: 21.35mm / Max. Height: 70.30mm
Cell Weight
< 67.0g
Operating Temperature
Charge: -20°C ~ 60°C / Discharge: -40°C ~ 80°C
Ex-factory Status
Voltage Range: 3.46V ~ 3.52V (~30% SOC)
Key Performance & Advantages
Ultra-Low Internal Resistance: The full-tab construction ensures an ACIR of ≤ 4.0mΩ, dramatically reducing thermal accumulation during extreme high-current discharging.
Extreme High-Drain Performance: Effortlessly handles continuous 40A discharging while keeping surface temperatures below 70°C. It can even sustain up to a 90A pulse/extreme discharge, delivering roughly 2.2Ah of capacity.
Exceptional Low-Temperature Resilience:
At -20°C under a heavy 40A discharge load (100% SOC), the cell maintains an initial voltage above 2.2V within the first 30 seconds.
At -40°C extreme cold, it reliably supports a 10A discharge current while keeping its initial 30-second voltage above 2.3V.
Outstanding Cycle Life & Longevity:
Heavy-Duty Cycle (+8A / -40A): Retains ≥ 80% capacity after 500 cycles (testing shows up to 87.7% retention at 600 cycles).
Fast Charge/Discharge Cycle (+15A / -30A): Retains ≥ 80% capacity after 500 cycles.
Deep Cycle (90% DOD, +8A / -10A): Retains ≥ 80% capacity after 1000 cycles.
Standard Cycle (+2A / -4A): Delivers up to 1500 cycles with ≥ 80% capacity retention.
Certified Safety Reliability: Fully compliant with strict international safety benchmarks, passing UN38.3 vibration, 1m drop, UL1642 crush (13kN), 2C/6V & 20A/20V overcharge, thermal oven (130°C for 100 min), and multi-resistance short-circuit tests with no fire and no explosion.
Core Applications
High-Power Electric Tools: Heavy-duty industrial drills, circular saws, lawnmowers, garden machinery, and commercial cleaning equipment.
Green E-Mobility: High-performance electric motorcycles, premium e-bikes, light electric vehicles (LEVs), and golf carts.
Portable & Home Energy Storage: High-wattage outdoor power stations, portable solar generators, and emergency home UPS backup systems.
Specialized Industrial Equipment: Industrial drones, Automated Guided Vehicles (AGVs), and smart warehouse robotics operating in demanding or cold climates.
Critical Safety Instructions & Usage Notice
Dedicated Charging: Always use a high-quality lithium-ion charger designated for 4.2V cut-off voltages. Never connect the cell directly to a conventional power outlet or attempt reverse charging.
Voltage Limits: Do not overcharge above 4.2V. In multi-cell assemblies or single applications, never attempt to recharge a cell that has been over-discharged below 1.5V.
BMS Integration Requirement: The cell must be integrated with a reliable Battery Management System (BMS) or Protection Circuit Module (PCM) providing comprehensive over-charge, over-discharge, over-current, short-circuit, and over-temperature protections.
Strict Welding Prohibitions: Refer to the official specification diagram for defined prohibited welding areas near the top of the cell. Never apply prolonged heat directly to the cell body with a soldering iron.
Short Circuit Prevention: Do not store or carry loose cells in pockets or bags alongside metal items like keys, coins, or screws. Terminals should be safely insulated with non-conductive tape during transit and handling.
Long-Term Storage: For storage exceeding 3 months, remove the cells from the equipment and maintain a State of Charge (SOC) corresponding to a voltage range of 3.45V to 3.95V. Store them in a cool, low-humidity, and temperature-controlled environment.
