Dell Authentic OEM Parts Model: GRT01; Voltage: 15.2V; Capacity: 64Wh/4000mAh 4-cell; Battery type: Li-ion Customer FirstRest assured with 30 days Refund and 12 months Warranty; 24 x 7 email support. We specialize in providing quality power products and quality customer service. (Note: return windows will close after one month, If you have any problem with battery, please Contact us - in YOUR ORDER options click the contact seller.)