Features: Designed for BL1830/BL1840 18V batteries, this protections board features intelligent current management technology to prevent overcharging/over discharging while extending battery lifespans through balanced voltages distribution. Engineered with premium PCB for enhanced thermal conductivity, this protections board ensures optimal heat dissipation during prolonged high intensity operations in demanding environments. Ideal for professional technicians and enthusiasts requiring reliability power management across multiple compatible tools in workshops or construction sites. Maintains stable performances during extended outdoor repairs, construction projects, or intensive home improvement tasks where battery durability is critical. Combines multilayer safety protocols with wide compatibility, delivering robust protections against voltages fluctuations and thermal stress for BL1830 BL1840 BL1850 18V battery powered devices. Specifications: Component: PCB Size:Approx.45x33mm/1.77x1.3inch Compatible for BL1830 BL1840 BL1850 18V batteries Practicality: Designed specifically to protect the battery, it can effectively prevent overcharge, over-discharge, short circuit and other problems, improve the safety and service life of the battery, and is suitable for daily maintenance and maintenance of various power tools. Package Includes: 1pc Battery protections Board note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.