You will be given a definition of a task first, then some input of the task.
Given an Amazon review, indicate whether it is a 'Positive Review' or 'Negative Review'.

This battery pack was not recognized by my Mac Book, Tried several things suggested by customer service, and would only work until computer was turned off or went to sleep. I could not get the computer to start up without the power cord. Returned and was issued a refund. The company has very good customer service.
Output:
Negative Review