[Conversion function] This adapter is for 18V battery BL1840 BL1840B BL1850 BL1850B BL1860 BL1860B BL1890 batteries, converting your for 18V battery into for 12V-14.4V Ni- Battery. [Compatibility] The battery adapter Work for 18V Lithiun Battery Fits for 12V-14.4V Ni- cordless power tools,(Note:Adapter only,no battery). [Easy installation] This battery adapter MT18DC12 Made of fireproof ABS material, Professional compact design and easy installation. For a long time don't use, please separate from the battery. [Note] Don't use the adapter to charge the battery When you need to charge the battery, remove the converter(Please Use for Original-Charger). [Note] Adapter Only Supports One-Way Conversion, Please Confirm The Correct Batteries & Tools Type Before Ordering. Our package only includes 1pcs of adapter, battery and tools are not included. Colour:Black Material:ABS Package Contents: 1 * Battery Adapter (battery and tool are not included) 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.