Dremmel stands behind there products!

That's neato. I had trouble like that with a Hitachi cordless impact I got from Lowes a few years ago. BOTH lithium ion batteries went bad within the first year. I called them and they said box up all of it and send it in. About two weeks later, I had it all back with two brand new batteries. It's been working great ever since. Best cordless tool I have ever owned in fact. I highly recommend them. I love good customer service.