Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good while it lasted

I liked it at first. It was compact, heated up quickly, warm enough to thaw my daughter's hands in the cold morning but not hot enough to hurt her, recharged easily. However, after boiling/charging for the second time, one corner of the plastic bag separated/opened, and white powder came out. Bye bye EZ Heat Reusable Hand Warmer....