Upgrade your Makita power tools with the 1pc PCB Circuit Board designed for BL1815, BL1860, LXT400, and BL1850 18V Li-ion batteries. This high-quality board features built-in dual IC for accurate cell voltage detection and usage monitoring. Benefit from comprehensive battery protection against overheating, overvoltage, undervoltage, overcurrent, and overcharging. With low voltage shutdown, this board ensures stable performance and durability. Perfectly sized and anti-vibration for optimal compatibility with Makita torque wrenches, impact drills, and angle grinders. Enhance your power tool experience with this essential accessory.