Customer ServiceRest assured with 30 days Refund and 12 months Warranty; Note: return windows will close after one month, dont worry about it, you can click on seller store on right corner ask a question and contact seller directly Basic DetailsItem Model: AP13J3K; Battery Type: Li-ion; Voltage:11.4V; Capacity: 45Wh/3990mAh; Battery Color: Black Compatible P/N AP13J3K AP13J4K KT.00304.001, KT.00303.001, KT.00303.011.(Note:Short cable 2.5cm. NOT fit for 4cm or 6cm long battery cable.) Compatible Laptop ModelsAcer Chromebook 11.6" C720P Series, Acer ChromeBook 11 C740 Series, Acer Chromebook CB3-431-C5EX Series.(NoteNot fit for Acer Chromebook 15 CB3-532-C47C N15Q9 Series) NoteThe package includes: 1*battery and 1*Instructions. Before purchasing, please open the back cover of the laptop to confirm the battery model and shape