I bought my Kindle Fire 32GB 8.9' a few days ago on eBay and it arrived today. It works like a charm, however, when I charge the Fire and continue to use it, the
  battery doesn't go up, but instead it loses battery.
  
  Does this mean I cannot use the Fire while it is charging? Should I power it off to charge and use it later?
  
  Or, is there an issue with my Kindle?
  
  Thank you! 
  Read more: Kindle Fire 8.9' Battery Help?