I'm going to disagree, at least sort of. Because you bought the light from an established company who probably cares about their reputation, ask them. Send Cygolight an email. Be truthful. Tell them how much you love their product, how much use you get out of it, and how sad you are that it's starting to break.

I buy a lot of cheap stuff, and most of it works great, but there is something nice about customer support.