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 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,