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: GB02XL; Battery Type: Li-ion; Voltage: 7.7V; Capacity: 47.3Wh/6000mAh; Battery Color: Black