Which mower? If your mower is less than 90 days old and you bought it at Home Depot, you can take it back for return/exchange. Your mower has a 5 year warranty. Battery has 3 year warranty. If over 90 days, give customer service a call. Best to call early in the day to avoid hold times. They can be reached at 1-855-EGO-5656 (1-855-346-5656) from 8:30AM - 8:00PM EST (Monday - Friday) & 10:00AM - 6:00PM EST (Saturday & Sunday).