My kindle fire hd wont charge correctly?

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Well my Kindle Fire Hd was charging two days ago and I wasted the battery to 5%.. I left it and I turned it off and haven't used it yesterday. I came home from school around 3 to go charge it.. while charging after 2 hours it hasn't turned on .. just on the charging screen with the battery with a little bit of charge on red. it hasn't turned on until 8.. then I was charging and I went on to Facebook then instagram then kik.. but the battery percentage was on 16% and quickly went down to 0% and turned off and hasn't turned.. I had it charging and it wouldn't turn on .. it automatically turns on and off. Now its on but the battery percentage keeps going from 5% to 0% to 3% & 4% .. and turns off repeatedly.. Help plese. Will this always happen? Does my Kindle have a problem? Please help what do I do !?