After sale warrantyRest assured 30 days full refund.12 months free replacement for Non-human factors.Email reply within 24 hours. (Note: return windows will be closed after one month. After that, you can click on seller store name on right corner, you can see "Ask a question" on the page and contact directly for any problem) SpecificationsBattery Model Name: C41N1731-2, Voltage: 15.4V; Capacity: 66Wh/4335mAh Color: Black; Type: Li-ion Battery Battery life: Up to 1000+ recharge cycles over the life of the battery.