You need this charger:
http://www.amazon.com/Amazon-Kindle-...e+Fire+Charger
The original charger will not work properly.
You also need this app:
http://www.amazon.com/GSam-Battery-M...words=gsam+app
It will show when your Kindle Fire is charging and when the charging is complete. The Kindle Fire does not have an external charging LED like other Kindles.