Instruct: Classify Amazon reviews into positive or negative sentiment
Query: a real dog

I purchased this vacuum cleaner at the beginning of September on the basis of good reviews from Amazon purchasers. I planned to use it as a quick pick-up on my kitchen's tile floor (crumbs etc.). It has proved to be a great disappointment. The batteries don't hold a charge at all, so after less than 5 minutes you find yourself pushing around a vacuum that makes a low moaning sound & picks up nothing. There's $60 down the drain. My advice to would-be purchasers: caveat emptor, & hold on to the packaging so you can return it if your experience is like mine