Converter Bottom: Compatible with 18V lithium battery. Adapter Top: The top of the adapter is compatible with 20V cordless power tools (WG151, WG251, WG540, WG891, WG151, WG151.5, WG800.1 power tools can be used). The corresponding lithium battery is for 20V WA3520, WA3525, WA3575, WA3578 power tools. The bottom of the converter is suitable for 18V lithium battery models: 48-11-1828, 48-11-1815, 48-11-1840, 48-11-1850, 48-11-1860, 48-11-1890. It is suitable for converting 18V lithium battery to 6-pin 20V lithium battery tools. Through this converter, you can use an 18V lithium battery on 6-pin 20V lithium battery tools, allowing your 18V lithium battery to be shared with 6-pin 20V lithium battery tools. This converter does not support sharing the charger between 18V and 20V lithium batteries. Type: Battery Adapter Precautions: 1. The adapter has a protective plate. When not in use for a long time, separate the battery from the adapter to avoid damage to the battery. 2. There is only one adapter included; batteries and electric drill tools are not included. The appearance and color of products may vary slightly by batch, which will not affect functionality. Color: Black Material: Plastic Package Contents: 1 x Converter Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement error allowance is +/- 1-3 cm.