Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Complete Disappointment

The performance of this replacement battery is abysmal. Although it is advertised to have a rating of 850 mAh, I barely get 5 hours of play time after a full recharge. By contrast, the original battery had a lower rating of 630 mAh, but it delivered 20 hours of continuous play time when I bought my mini 4 years ago.Another issue is the dimension of the battery, which is a few millimeters wider than the original EC007-5. After the battery was squeezed into place, the circuit board was bent to one side due to the tension buildup by the bigger battery. Although the curvature is small, it caused the LCD screen to press more tightly against the glass panel.In short, I am very disappointed with this product.