Hi @Steelerman, 

Welcome to the Dyson Community! This sounds like an unusual issue, and to help pinpoint the cause we'll need our Customer Care experts to take you through some further troubleshooting checks when you have your Dyson V15 Detect vacuum fully charged and easily to hand. If a replacement part or a repair is needed, they’ll be able to confirm if this is covered under your Dyson warranty.

Please visit Dyson.com and click the round purple button to launch the Dyson Digital Assistant. Then click the agent icon in the bottom left corner of the chat window to start a conversation with our Customer Care team.

We'll look forward to speaking with you!

While awaiting assistance from the Dyson team, try these troubleshooting steps:

Clean the battery contacts on both the battery and the vacuum using a dry cloth to remove debris or oxidation.
Ensure the battery is fully inserted and securely clicks into place to avoid loose connections.
Power cycle the vacuum by turning it off, waiting for 30 seconds, and then turning it back on after reconnecting it to the charging dock.