General description Plastic Case Nesting Protection Board Cell Detection PCB designed for 18V BL1840, BL1850, and BL1830 batteries. This product allows you to build a battery pack using 10 pieces of INR18650 battery cells, enabling DIY battery capacity customization for your devices. It is made from high-quality materials, ensuring durability and professional use. Technical specifications Compatible with: BL1815, BL1830, BL1840, BL1850, BL1860, LXT400 Replacement battery codes: 194204-5, 194205-3, 194309-1, 194230-4 Material: Plastic Color: Black Measurement allowed error: +/- 1-3 cm Usage Helps to repair and assemble the battery pack Features a built-in memory chip and CPU for automatic battery charging effect LED indicator to monitor remaining power Other information Battery protection board with single cell protection detection Latest upgrade circuit board with single cell balance detection function to prevent overcharge and overdischarge Safeguard features against incorrect