Replacement battery fits 97 Acer compatible models. Specifications: 4400mAh, 11.1V, Li-ion. Compatible with: Extensa 5220, Extensa 5620Z, Extensa 5630, Extensa 5635, Extensa 5635Z, Extensa 5210 and 91 more compatible models. Replaces: Acer AS09C31, Acer AS09C70, Acer AS09C71, Acer AS09C75, Acer BT.00605.022, Acer GRAPE32 and 8 more. Acer replacement battery designed for Notebook/Laptop devices.