INR21700-RS50 5000mAh 70A High-Drain Tabless Lithium-ion Cell for Drone power tools

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 ($le 4.0text{m}Omega$). 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.

• Ultra-Low Internal Resistance: The full-tab construction ensures an ACIR of $le 4.0text{m}Omega$, 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 $-20^circtext{C}$ under a heavy 40A discharge load (100% SOC), the cell maintains an initial voltage above 2.2V within the first 30 seconds.

  • At $-40^circtext{C}$ 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 $ge 80%$ capacity after 500 cycles (testing shows up to 87.7% retention at 600 cycles).

  • Fast Charge/Discharge Cycle (+15A / -30A): Retains $ge 80%$ capacity after 500 cycles.

  • Deep Cycle (90% DOD, +8A / -10A): Retains $ge 80%$ capacity after 1000 cycles.

  • Standard Cycle (+2A / -4A): Delivers up to 1500 cycles with $ge 80%$ 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.

• 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.

• 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. The system must cut off discharge if any cell drops below 2.5V ($>0^circtext{C}$) or 2.0V ($le 0^circtext{C}$).

• 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.