1Design is simple, durable, convenient.2Product built-in battery lock fixed combination battery.3Built-in Protection Board(PCBA) for battery discharging.4Applicable models: 18V/20V5This conversion adapter converts for BL1820 BL1830 BL1840 BL1850 BL1415 BL1420 BL1815 BL1860 BL1830B BL1840B BL1850B BL1860B to 18V/20VIt allows your 18V/20V max to share batteries with Tools, saving money.For a long time do not use, please separate from the battery.This converter does not support the ability to charge the battery.colour: blackMaterial: ABSsize: 94x73x45mmPackage Contents: 1 x Conversion AdapterOnly the above package content, other products are not included.Note: Light 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.