Easy to install or remove - first install the adapter and tighten, put the battery into the adapter. Then steps to remove the battery for charging or replacement, release it from the adapter, and charge or replace the battery. Made of high quality plastic, solid design, with Safety Circuit Protection, built-in smart control system. and safe, convenient to carry and easy to use. High-quality components: The internal circuit board is assembled with high-quality components to efficient and stable power output. It provides over-voltage, over-current, overheats and short circuit protection.Multiple Protection & Safety System, Easy to Install & Remove. Compatible with for V7 V8 series,Compatible with for 18V battery lithium-ion Compact Cordless Packs Recommend to use 4A and above batteries because of the high power for vacuum. The products are only used for flexible conversion between one tool and another lithium battery, and do not involve any other ! The products are only converter, not charger, not battery, not machine, also can not recharge battery by it. Due to different production batches, labeling is random and does not accept designation and does not affect use. Colour:Photo Color Material:Plastic Part Number:BS18DSV7V8 Package Contents: 1 x Battery Adapter(Adapter only, tool and battery not included) 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.