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

Just received the traveldock. I purchased this because of it portability. I was disappointed to discover that it will not operate on battery power as claimed. Works fine on ac power however using battery power only provides a split second of audio followed by a couple of second of static then nothing. Unit came with 4 AA batteries. I replaced them with fresh batteries but the problem persists. Returning it today.