Features: This 5V 1 s lithiums batteries USB charging module delivers rapid 3.6 a charging with triple protections against overcharge, short circuits, and overheating, ensuring safe power transfer for battery powered devices. Featuring integrated heat sink and compactly design, the module maintains stable operation during high current charging while offering clear LED status indicators for real time monitoring. Ideal for DIY electronics enthusiasts and engineers developing portable gadgets, drones, or IoT devices requiring reliable lithiums batteries management solution. Perfectly integrates into powerbanks, handheld tools, and emergency lighting systems where space efficient USB charging with battery protections is critical. Engineered with universal 5V USB compatibility and solder friendly terminals, this protections board simplifies prototyping while meeting commercial grade safety standards for lithiums applications. Specifications: Component:meshes Fabric Size: Approx.22x21mm/0.86x0.83inch Option Type;1pc,3pcs Output voltages: 5V Output Current: 3.6 a (most) Conversion efficiency: 93% Applicable scenario:Portable equipment: Provides efficient charging solution for mobile power supplies, handheld devices. Package Includes: Package A 1pc Battery Charging Module Package B 3pc Battery Charging Module note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.