Description
The Crocks Ultra 11.1V 21000mAh 3S Drone Battery Pack 3S5P 420A Discharge Li-Ion NMC 42A
Crocks Ultra 11.1V 21000mAh 3S5P Li-Ion NMC Battery – 420A is a high-endurance, high-power Li-Ion NMC battery pack designed for premium drone and UAV operations. Built using fifteen high-performance 21700-class NMC cells, the pack is configured in a 3-series, 5-parallel layout, allowing a nominal pack voltage of 11.1 V and an impressive 21 Ah (21,000 mAh) capacity.
What really sets this pack apart is its extremely ambitious 420 A continuous discharge rating — ideal for power-hungry, high-thrust applications such as racing quadcopters, heavy-lift drones, or professional cinematography platforms. The NMC chemistry offers high energy density, helping the pack store a lot of energy without becoming prohibitively heavy.
A robust internal structure, thick wiring, and a reliable high-current discharge lead make the pack capable of sustaining large current flows. For safe and efficient charging, the pack supports a multi-pin balance connector, helping ensure each of the series groups stays properly balanced while charging.
performance.
Key Features
Huge Energy Reserve: 21,000 mAh capacity for extended flights
High Discharge Power: Spec’d for 420 A continuous current
NMC Chemistry: Excellent energy density + balance of performance and safety
3S5P Configuration: Combines stable voltage with parallel current capacity
Balanced Charging: Includes balance connector for safer charging cycles
Durable Construction: High-quality internals and wiring for reliability
High Power Density: Optimized for high-thrust flights and long missions
Applications
Racing / Freestyle Drones (when you need power + duration)
Long-Range Quadcopters / Exploration UAVs
Heavy-Lift / Professional Payload Drones
Cinematography & Surveying Drones
Custom DIY UAVs where energy + high current are both critical
