Built-in battery lock fixed combination power tool battery, non-slip design. For a long time do not use, please separate from the battery. Can not be used for power tool battery charging, this adapter will not fit into any chargers. If you need to charge your power tool batteries, please use the battery chargers. Product model: for Makita to SKIL Converter bottom Applicable to for Makita Battery model Lithium-Ion 18V Battery: BL1815, BL1815B, BL1820, BL1820B, BL1830, BL1830B, BL1840, BL1840B, BL1850, BL1850B, BL1860, BL1860B, BL1845, BL1890, BL1890B Converter top Convert to SKIL Battery model: PWR CORE 20 Lithium 20V: BY519702, BY519601 Functional features: for Makita 18V lithium battery is converted to SKIL 20V lithium battery tools. This converter can be used for SKIL 20V lithium battery tools. for Makita 18V lithium battery allows your for Makita 18V lithium battery to share batteries with SKIL 20V lithium battery tools. This converter does not support charging for Makita 18V lithium battery through the converter! Note: a. This product is only adapter. No includes the battery and machine in the picture. b. This product does not include machine and battery. The machine and battery in the product description are only used to show the products Material: plastic colour: As shown 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.