Features: Multiple High Current Protections: Supports 3S /4S battery packs with 40A/60A continuous discharge current, ideal for power tool, energy storage systems, and electric vehicles requiring robust power protections. Comprehensive Safety Mechanisms: Features overcharge, over discharge, overcurrent, short circuits, and temperature protections to instantly cut off abnormal circuits, preventing battery damage and ensuring operational safety. Smart Balanced Charging: Builts in voltages balancing circuit automatically equalizes cell voltages during charging, maximizing battery capacity utilization and extending overall use. Industrial Durability: Quality PCB components ensures stable performances under continuous operate, suitable for demanding industrial and outdoor environments. Plugs and Play Installation: Clearly labeled terminals (charging/discharge port) with markings enable quick setup without debugging, perfect for battery packs or bulk device assembly. Specifications: Component: PCB Size:Approx.44x55mm/1.73x2.16in (reinforcement ), 45x60mm/1.77x2.36inch (with balanced ). Option Type:3S 40A (reinforcement),4S 40A (reinforcement),3S 60A (reinforcement),3S 40A (with balanced),4S 40A (with balanced),4S 60A (with balanced), Charging Voltages:DC12.6V-13.6V Current:40A(Most) Usage scenario:repair of power tool battery pack, Portable energy storage power supply assembly; Package Includes: 2pcs Battery Protections Board 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.