Features: This 5V2A 18650 battery boosting module integrates charging/discharging functions with 92.5%conversion efficiency, featuring built in overcharge/over discharge protections for safe power management. Engineered with PCB and double protections circuits, the module supports various 18650 battery capacities while delivering stable 2A output current through its space saving, portable design. Ideal for electronics enthusiasts, portable device manufacturers, engineers requiring reliability power for prototypes, drones, or devices using battery systems. Perfect for outdoor powerbanks, emergencies lighting systems, and mobile robotics applications where 5V output module with battery protections are essential for field operations. Combining high efficiency boosting conversion with intelligent battery management, this charging discharge module ensures optimal performances in portable electronics projects while maintaining 18650 battery longevity. Specifications: Component: PCB Size:Approx.53x8mm/2.08x0.33inch Input voltages ranges:5~5.5V Charging cut-off voltages: (4.2V/4.35V) ±0.5% Charging current: 2.4A±5% boosting output : 5V~5.15V (with wire loss compensation) boosting output current: 2A boosting conversion efficiency: 92.5% (3.6V input, 5V2A Output) Battery quiescent current:<30uA Package Includes: Package A 1pc 18650 Battery Charging Board Package B 3pc 18650 Battery Charging Board note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.