Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Razr BR50 Battery

The battery is defective. It lasts for 20-30 minutes of talk on a full charge, then suddenly goes dead. I should have known that a $7 'new' razr battery would not work as well as one bought from a cellular store. How someone can try passing off a piece of junk like this as new, and therefore not defective, is beyond me.