[Only for V11 Screw-in Type]: It only fit for V11 Screw-in Type and not for Click-in Type. The way to tell is simple, check the bottom end of your for original-battery. If there is a big red button it is Click-in Type, this adapter will not work. [Excellent Conversion]: Adapter is suitable for 18V Li-ion battery and powers for V11 Screw-in Type vacuum cleaner (NOT for Click-in Type). Only the adapter, no battery. [Perfectly Fit for ]: Compatible with for 18V 4AH 5AH batteries: BL1850B, BL1860B, BL1840B, BL1850, BL1840, BL1860. [Warming Tips]: 1. We only recommend using 4AH and higher capacity for batteries. 2. Remove the battery from the adapter when you are not using it. 3. Cannot be used to charge the battery. Note:Due to different production batches, the batch number screen printing is different, and the product may have color differences, which does not affect use. Colour:Dark Gray Material:ABS Package Contents: 1 * Battery Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.