1. The product has a built-in battery lock for fixing the combined battery. The battery lock is made of high-quality and strong plastic material, which is durable and convenient. 2. Built-in battery and tool buckle, anti-skid and anti-loose design, to that the battery and the tool are perfectly matched, safe and reliable. 3. It is suitable for converting 18V lithium battery to Black & ,, 18V 20V lithium battery tool converter Type: Converter caveat: 1. Since the converter has a built-in protection board, if you do not use it for a long time, please separate the converter from the battery to avoid damage to the battery 2. The converter does not support battery charging 3. Please confirm the relevant battery type and use the machine at the time of purchase to avoid errors. Machines with these types of batteries: : BL1518, BL2018, 18V lithium battery LB20,LBX20,LBXR20,LB2X2020,LB2X3020,LB2X4020,20V lithium battery Bupai: PCC680L, PCC681L, PCC682L, PCC685L, 20V lithium battery : FMC680L, FMC687L, FMC688L, SCB20C-A9, SCB20D-A9, 18V lithium battery Batteries for these models: BL1815, BL1815B, BL1820, BL1820B, BL1830, BL1830B, BL1840, BL1840B, BL1850, BL1850B, BL1860, BL1860B, BL1845, BL1890, BL1890B, 18V lithium battery colour: black Material: plastic Size: 11x8.5x5.5cm Package Contents: 4 x Battery Converter Adapter 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.