This is a battery and charger for the Dyson Digital Slim Fluffy. I purchased this as a spare from the Dyson online shop when I bought the Digital Slim Fluffy. I have used it a few times. Having the charger allows you to charge the battery separately from the vacuum cleaner body. I have confirmed that the battery can be charged by attaching it to the vacuum cleaner body and that the vacuum cleaner can be turned on. I have also confirmed that the charger lights up when connected to the battery.