[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 for 12V cordless power tools,(Note:Adapter only,no battery). [Perfect battery converter] Made of high quality plastic material, it withstands high temperatures and falls. Save your money and rest to use tools. [Advantage]: Made of high quality materials, robust, portable design, easy to use. This product is only a battery adapter, not a battery charger, can not be used to charge the electric . Easy to DIY operateBattery DIY converter, make full use of home batteries. The products are only used for flexible conversion between one tool and another lithium battery, and do not involve any other ! The products are only converter, not charger, not battery, not machine, also can not recharge battery by it. Due to different production batches, labeling is random and does not accept designation and does not affect use. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Color: Black Material: plastic Package Contents: 1 x Adapter (battery 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.