Enhanced Compatibility: This 21V 100A temperature-controlled power tool protection board is designed for 18650, ensuring a and optimal performance for your power tools. Easy to Install: The board is user-friendly and has a simple installation process, making it an ideal choice for professionals and DIY enthusiasts. Advanced Protection: Equipped with an advanced charging protection circuit board to prevent overcharging, overheating and short circuits, thereby extending battery life and improving performance. Efficient Design: This battery protection board allows for seamless and safe battery installation and connection. Enhanced Safety Features: Equipped with advanced charging protection features to prevent overcharging, overheating and short circuits, extending battery life. Color:As Shown Material:PCB 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.