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 Ask a question and contact directly for any problem. SpecificationsBattery Model: L20C4P71 ** Voltage: 15.44V ** Capacity: 57Wh 3695mAh ** Type: Li-ion Battery