Designed specifically for 21700DC models, ensuring optimal compatibility and performance. Perfectly fits for 18V 21V series batteries, making it a versatile choice for various applications. Includes overcharge, over-discharge, and short circuit protection to enhance safety and extend battery life. Easy installation allows for quick and hassle-free setup, saving time and effort. Built with high-quality materials to withstand regular use in tough conditions, ensuring durability and reliability. This protection board is essential for maintaining battery health, providing peace of mind while using your tools. Its robust design and safety features a must-have for anyone relying on batteries. Enjoy enhanced performance and with this reliable protection solution. Color: As Shown Material: ABS+PC Package Contents: 1 * Battery Protection Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.