My battery is blinking, will not charge... barely 6 months old.

Steve, to echo what Blue said, the customer service contact info is 1-855-EGO-5656 (1-855-346-5656) from 8:30AM - 8:00PM EST (Monday - Friday) & 10:00AM - 6:00PM EST (Saturday & Sunday).

If James' trick doesn't work customer service will be able to tell whether the battery is the problem or whether it's the charger or the tool. If it's the battery they will get one shipped to you in a matter of days. It's an easy process.

What are the symptoms you're experiencing?