Instruct: Classify the given review into positive or negative sentiment.
Query: DEFECTIVE UNIT

I PURCHASED THIS FOR MY DAUGHTER AND SON-IN-LAW FOR THEIR BIRTHDAY. THEY PLUGGED IT IN AND IT WORKED FINE BUT WHEN THEY TRIED TO PLACE THE BATTERIES IN THEY DID NOT STAY IN. THE SPRINGS ARE MISSING TO HOLD THE BATTERIES. I HAVE REQUESTED A RETURN AUTHORIZATION AND WILL REPLACE IT. I WILL AGAIN RESPOND WHEN I SEE HOW THE RETURN GOES.