BuyBatts Battery Fits Acer 77Z-489 Notebook Laptop Portable Computer Item Dimensions: 10.68in X 2.09in X 1.55in (271mm X 53mm X 39mm) Item Type: This item is an extended capacity 9 cell battery. This battery is physically larger than batteries with fewer cells and may stick out from your computer when installed. Please compare the ratings to determine if this battery is different from your current battery. Capacity: 6600mAh; 71Wh Output Voltage: 10.8V Cell Count: 9 Cells