Hi,
Here’s a link to the relevant section of the [https://www.manualslib.com/manual/1318480/Sharper-Image-Dx-2.html?page=5#manual|user manual] that shows how to charge the battery in the drone.
You may find that the battery may not charge at all as it may have been depleted beyond recovery and will have to be replaced.
If it doesn’t start to charge leave it on charge for 2-3 hours to see if this will “kick start” it back into charging. If it does allow it to fully charge before use.