Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Unreliable Batteries make this a waste of money

I often wonder if Black & Decker hires professional reviewers to praise their vacuums on this website and other online retailers. I say this because the reviews tend to average 4 out of 5 stars (Amazon & Target), yet my experience with these Black & Decker models is the exact opposite. In my opinion, they are a waste of money. I've bought two different models (CHV1586 most recently) and these pieces of junk won't hold a charge for more than a minute after 3 months of consistent daily use. It's so frustrating, especially when the batteries are nearly impossible to find and can't be replaced for less than the price of a new vacuum. Avoid Black & Decker hand vacs!