Advanced 21V balanced protections board technology with temperature controller ensures stable charging/discharging cycles, extending battery service life and optimizing power tool performance. Crafted from PC, the housing resists impacts and abrasions while maintaining structural integrity in demanding work environments. Ideal for professional craftsmen and DIY enthusiasts requiring a reliable power solution for extended operation of tools. Suitable for construction sites, workshops, and industrial settings where battery accessories withstand daily wear from power tool applications. Integrated 5Mos3 alloy circuit and intelligent temperature management system deliver consistent power output while preventing overheating during intensive tool operation. This battery accessory is designed to enhance the performance and longevity of your power tools. With its robust construction and advanced technology, it provides a reliable power source for various applications, ensuring that you can work efficiently and safely in any environment. Color: Red Material: PCB Package Contents: 1*Protection Board