Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed

I followed directions and charged the battery 8 hours, put it in the sweeper, and it worked great! For all of 10 minutes. Then it revved its motor, stopped, and has not worked again. We have tried charging the battery again, checked to make sure everything is where it's supposed to be, but all for nothing. The machine does not work. That was an expensive 10 minute sweeping job.