The Vax Blade ONEPWR BV25040 5INR22/71 4.0Ah 72Wh 18V battery is specifically designed for the Vax Blade 4 model vacuum cleaner. It is a black electric battery suitable for stick and handheld use. This unit is compatible with Vax products and includes one battery in the pack. Made in China, this high-quality battery is a reliable power source for efficient cleaning around the home. With a brand like Vax, you can trust that this battery is built to last and keep your vacuum running smoothly.