This 18V to 21.6V battery adapter is designed to running Dyson V6 series cordless vacuum. Well compatible with Dyson V6 Animal Vacuum, V6 Motorhead Vacuum, V6 Trigger Vacuum, V6 Absolute Vacuum, V6 Slim Vacuum, V6 HEPA Vacuum, V6 Cord-Free Vacuum, V6 Fluffly Vacuum.