Bad product

I bought the Tablet from Musica just over a year ago for my Daughter to watch her video's and play games on . Tablet was used probably 4 or 5 months ago and was stored with other electronics like laptop and so forth . Yesterday i take the tablet out so that i can charge it again and load new Content like educational applications on for her but then I see the battery has turned it into a BOMB . screen cracked , battery is swelling .Thinking about it that it actually got warm when we played or had applications running on it as my daughter will say it is hot