INR21700-RS50 5000mAh 70A High-Drain Tabless Lithium-ion Cell for Power Tools and Drones

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.

• 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.

• 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.