Replacement Li-Polymer Internal Notebook Battery for ACER ASPIRE E3-111 E3-112 E3-112M E5-771 E5-771G ES1-111 ES1-111M ES1-131 ES1-311 ES1-331 ES1-511 ES1-512 ES1-520 ES1-521 ES1-531 ES1-731 EXTENSA 2508 , NP.ADT0A.025, AC14B8K-BTI 4-cell 15.2V,3270mAh