I bought a nebula Anker capsule 1 about a year ago. I was a huge fan, until last week… The battery seems to break down. Charging takes more than 24hours…
Any one with the same problem or even better… A solution?
Battery charging time
If you under warranty you should contact the support.
But change charging cable and charger first, may be there is an issue. 
What wall plug are you using? And whats its power output rating?
@wouter_de_meester As suggested, you might be best in the first instance trying a fresh micro USB cable and make sure your charging adapter is capable of 2A output…
If you are still experiencing long charge times (longer than 3-5hrs) after this I would suggest you reach out to support@seenebula.com if you are still under warranty for further assistance.