The Vax Blade ONEPWR 4.0Ah MAX is a rechargeable Li-ion battery designed for the Vax Blade 4 vacuum cleaner. This sleek black battery is compatible with the Vax brand and is suitable for stick and handheld use. With a power source of electricity, this unit is essential for maintaining the functionality of your Vax vacuum. Manufactured in China, this battery is a genuine Vax product, ensuring reliability and quality for your cleaning needs. It is used but in very good condition. Please see photos.