Features: 【Intelligent Temperature Control protections】Features a built-in intelligent temperature control that effectively prevents battery overheating, thereby extending battery life. 【High Current Capacity】Supports currents up to 100A. Optimised circuit design meets the demands of powerful electric tools. 【PCB Module Advantages】Utilises premium PCB offering excellent thermal conductivity and durability, enhancing resistance to environmental fluctuations. 【Overcharge and Over-Discharge protections】Integrates advanced overcharge and over-discharge protections to prevent battery damage and enhances safety. 【Compact and Lightweight Design】Features a compact structure and lightweight construction for easy installation and portability, saving valuable space. Specifications: Component: PCB,Precise circuit design ensuring the stability and durability Dimensions: Easy to integrate into various power tools. Suitable for 21V voltages supports 100A high current, with temperature control function, and provides multiple protections. Practicality: The battery management widely used in power tools Size about 7.5x4cm/2.95x1.57in Package Includes: 1PC Battery protections board 21V 100A note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution