1. Can built-in 10Pcs INR18650 battery cells. 2. DIY the battery capacity of your machine. High quality for professional use 3. High compatibility with the old device and more. Helps to repair and assemble the battery pack 4. Safe and most improved balance detection function 5. The latest circuit board, multiple protection. With LED Indicator Type: Battery Storage Box Replacement Battery Codes: BL1830 BL1840 BL1860 BL1850 LXT400 . Suitable Power Tool Models: for 18V Li-ion Cordless Power Color: Black Material: Plastic Package Contents: 4 x Battery Case Set (Some accessories are random, you can't choose the designated accessories) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.