Battery Adapter Converter for Ryobi 18V Battery to Replace for Dyson V6 V7 V8. 【Compatible with Dyson V7 V8 Vacuum】Our battery adapter is designed for Dyson V7 V8 series vacuum cleaner. 【Compatible with Dyson V6 Series Vacuum】Our RY18V6 adapter is designed for Dyson V6 Series Vacuum Cleaner.