The vacuum is working, and the battery is used and its performance/capacity has reduced with age.
Depending on your expected runtime, the battery may need replacement, so please consider this when purchasing.
Specifications shown on the original label:
* Model: Dyson V6 / SV10
* Battery: 21.6V Li-ion
* Original battery capacity: 2800mAh / 65Wh
* Power: 425W
The vacuum and accessories have normal signs of use, as visible in the photos.