Built-in battery lock fixed combination power , non-slip design. For a long time do not use, please separate from the battery. Can not be used for power charging, this adapter not fit into any chargers. If you need to charge your power tool batteries, please use the battery chargers. Product model: for to Converter bottom Applicable to for battery model , 48-11-1880, 48-11-1835, 48-11-1865, 48-11-1890, 48-11-1860, 48-11-1850, 48-11-1812, 48-11-1840, 48-11-1820, 48-11-1815, 48-11-1828 Converter top Convert to battery model: PWR CORE 20 Lithium 20V: BY519702, BY519601 Functional features: for 18V lithium battery converted to 20V lithium battery tools, through this converter you can use for 18V lithium battery on 20V lithium battery tools, so that your for 18V lithium battery and 20V lithium battery tools share the battery. This converter does not support the for 18V lithium battery charging 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.