Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Shipped worthless batteries

Bought 2 of these. Have followed all charge instructions to the letter. Even researched proper procedures on black and decker website. Even thought my charger might not be good so replaced it too. But these batteries were completely worthless. They last only a couple minutes. I suspect that I was sold used batteries by amazon. $75 down the drain. Far too much trouble to try to receive a refund. It's not wise to buy large batteries like this from an on-line retailer. Better to buy from a store where they can be easily returned.