The SunPower INR21700-50SE is undoubtedly the top choice for FPV (First-Person View) applications, offering the ideal combination of high burst power and long endurance, perfectly meeting the demands of drones such as racing quads and vertical take-off fixed-wing aircraft. This is a cost-effective domestic alternative to the Samsung 50S, providing high performance at a competitive price.
Core Specifications (FPV-Optimized)
- Capacity & Voltage: 5000mAh @ 0.2C, nominal 3.6V, with an energy density of 18Wh. The single-cell capacity reduces the need for multiple cells in series or parallel, improving weight and reliability.
- Discharge Performance (Key): Continuous discharge at 35A (7C), peak instantaneous discharge of 90A. This matches FPV’s need for high current bursts during aggressive acceleration and throttle changes, with minimal voltage sag and stable power output.
- Internal Resistance: AC internal resistance ≤15mΩ, with actual measured values as low as 12.56mΩ. Excellent consistency ensures low charge/discharge loss and minimal temperature rise during heavy use, providing safer, more reliable performance in intense FPV flight conditions.
- Basic Specifications: Charging cutoff at 4.2V, discharge cutoff at 2.5V, max charging current 7A, operating temperature range from -20°C to 75°C, with a cycle life of ≥700 cycles, ensuring long-lasting performance for high-frequency FPV use.
Key Advantages for FPV Applications
- Power and Endurance Balance: The 5000mAh capacity combined with a 7C high discharge rate delivers both the explosive power needed for racing drones and longer flight times compared to lower-capacity cells, making it ideal for 5-inch/7-inch racing quads and vertical take-off fixed-wing aircraft.
- Safety and Stability Maximized: Featuring a steel casing cylindrical structure, the cell eliminates the risk of swelling or leakage typically seen in pouch cells. The low internal resistance design prevents overheating under high current loads, ensuring safe use in outdoor FPV environments.
- Cost-Effectiveness vs. Imported Cells: Performance comparable to the Samsung INR21700-50S, but at a significantly lower cost, making it an excellent choice for mass assembly of FPV battery packs without compromising on performance.
- Fast Charging for High-Frequency FPV Use: The cell supports high-current fast charging, offering quick recharging capabilities for frequent test flights and operations, ensuring pilots are ready to go at a moment’s notice.
FPV Application Assembly Options
- Racing Quads: 6S1P/6S2P configurations, ideal for 5-7 inch drones. Continuous 35A and peak 90A discharges fully cover the current demands of high-speed flight.
- Vertical Takeoff Fixed-Wing: 4S2P/6S2P configurations. Large capacity for extended flight time, while the high discharge rate ensures stable power during vertical takeoff, landing, and maneuvering.