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: GM02XL, Battery Type: Li-ion; Voltage: 7.7V; Capacity: 47.3Wh/6150mAh; Battery Color: Black