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 ABS, 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