Hi there! It sounds like you have our Linx stick vacuum or hand vacuum model. Plug only the charger into an outlet, the blue light on the charger should flash once. If the light on the charger flashes once then the charger is fine. Try resetting the battery by following these quick steps below.
1. Remove the battery from charger or cleaner
2. Unplug the charger
3. Insert the battery into the vacuum and turn the unit on for 30 seconds (even if it has no power)
4. Remove the battery
5. Plug the charger into an outlet, make sure the light on charger blinks blue once.
6. Insert battery into charger
The light should be a solid blue, indicating the battery reset worked. If so, allow the battery to charge for 3-4 hours, completely deplete battery on your next use and re-charge. If the light on the charger is still blinking, your battery will need to be replaced. I have included a link where you may go to purchase a replacement battery if needed. Hope this helps!