Hello, Homedepotcustomer - We're very sorry that one of your batteries is defective and that you are having trouble getting it replaced! We expect our batteries to provide years of reliable service, which is why they are backed by a 3-year limited warranty and are also eligible for the Lifetime Service Agreement when registered within 90 days of purchase. If you would, will you please email us at Reviews@RIDGIDmail.com? Let's connect so we can make this right for you!