Fits M18, 48-11-1815, 48-11-1850, 48-11-1820, 48-11-1840, 48-11-1815 compact batteries. In this product, we have added and equipped a fuse, which can increase the safety of the product. The main role of a fuse is to protect electrical equipment from overcurrent and overheating. The fuse is properly placed in the circuit. When the current abnormally rises to a certain height and heats up, it will fuse and cut off the current to protect the safe operation of the circuit. This battery adapter locks your battery nicely, installation is very simple, just gently move the power installation connector The battery adapter is made of high quality material, the battery adapter is durable and lightweight. It has excellent scratch and impact resistance and chemical resistance, and is impermeable to heat, moisture, and corrosion, making it perfect for indoor and outdoor use. color:Red Material:plastic Package Contents: 4 x fuses 2 x connector 2 x terminals Only the above package content, other products are not included. Note: Light shooting 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.