1. The integrated dual IC detects the voltage of each cell. And the number of uses2. Each battery can be detected and . Overheat protection, overvoltage protection, overvoltage protection, overload protection.3. The entire new for series achieves low voltage shutdown;4. Stable and anti-vibration. It is the best partner for wrench and impact drill and grinder.5. This product is component without battery core.6. It is used to repair and batteries pack,only for people who are familiar with battery performance and have practical experience in battery assembly.Battery Plastic Case Charging Protection Circuit Board For 18V BL1830 BL1815 BL1860colour: blackMaterial: PCBPackage Contents: 1 set*Battery shell casing(no battery cell)Only the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.