Description
The Crocks Pack Genx pro INR 21700 P42A 11.1V 8400mAh 3S2P 120A/170A Discharge Li-ion Drone Battery Pack
is a high-performance Li-ion battery pack built for demanding drone applications — especially FPV racing, freestyle, and other high-thrust use-cases. This pack uses six Molicel INR 21700 P42A cells arranged in a 3-series, 2-parallel configuration. The design delivers a nominal voltage of 11.1 V while offering a generous total capacity of 8,400 mAh, striking an ideal balance between energy density and discharge capability.
Despite the high capacity, this pack is built for power: it’s rated for continuous discharge of up to 120 A, with peak discharge capability reaching up to 170 A. These high currents make it suitable for aggressive throttle maneuvers, fast acceleration, and bursts of extreme power demand — while still delivering long enough flight times for serious operations.
Each Molicel P42A cell is engineered for high current draw. According to its datasheet, it supports a continuous discharge of 45 A per cell. The cell has a nominal voltage of 3.6 V, a typical capacity of 4,200 mAh, and very low internal resistance (AC ~10 mΩ). The low resistance helps minimize voltage sag and heat generation, even under high loads.
In terms of physical size, each cell has a maximum diameter of ~21.7 mm and a height of ~70.2 mm. The typical cell weight is about 67 g. As a result, the full 3S2P pack is quite compact and powerful — ideal for drones where both weight savings and high current demand matter.
The pack is equipped with a 4‑pin balance connector to enable balanced charging between the parallel strings, and a high-current discharge connector (e.g. XT‑60 or similar) to sustain the heavy discharge currents during flight. The construction is rugged and vibration-resistant, making it well-suited to the high-G and high-vibration environments of FPV drones.
Key Features
High Discharge Performance: 120 A continuous, up to 170 A peak discharge.
Large Capacity: 8,400 mAh for extended flight durations.
Premium Cells: Uses Molicel 21700 P42A — known for low internal resistance and high-current stability.
Low Voltage Sag: Thanks to low internal resistance (AC ~10 mΩ).
Efficient Pack Design: 3S2P layout gives the right mix of capacity and power.
Balanced Charging: With a 4-pin balance connector for safe charging.
Robust Build: Durable wiring and rugged mechanical design for drone use.
Wide Operating Temperature: P42A supports discharge down to –40 °C and up to +60 °C.
Applications
This battery pack is highly suitable for:
FPV Racing & Freestyle Drones: For pilots who need both power and flight time.
High‑Thrust Quadcopter Builds: Ideal for drones with powerful motors or heavy payloads.
Long-Range / Endurance Missions: Where battery capacity and reliability are key.
Custom UAVs: Handy for DIY drone builders who demand a high-discharge, high-capacity pack.
Photography / Cinematic Drones: Can power camera + gimbal setups for longer flights.
