Since it's also doing it on the mower, give customer service a call. The battery has a 3 year warranty. They will take care of you. 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).