Features: This replacement 18V Ion Battery PCB Circuit Board serves as a direct compatible upgrade for models R840083/R840085/R840086/R840087, ensuring seamless integration with existing battery packs through standardized PCB design. Featuring advanced charging protections circuitry, this circuit board prevents overcharge, over discharge, and short circuit risks while maintaining stable power output for prolonged tool operating. Ideal for enthusiasts and professional technicians experienced in battery pack assembly, this component enables cost effective repairs without requiring full battery replacement. Perfect for workshop environments where power tool batteries need frequent maintenance, this PCB board allows users to rebuild customized battery packs using preferred lithium ion cells. Engineered for durability and precise voltages regulation, this bare circuit board (excluding battery cells) meets OEM specifications, making it essential for restoring 18V tool battery functionality. Specifications: Size: Standard size, suitable for R840083 R840085 R840086 R840087 model battery Suitable for 18V battery Used for repair and assembly of battery packs This product is a battery charging protections circuit board,without battery Size about 10.2cm/4.02in Package Includes: 1PC Battery charging circuit board note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.