I purchased a 1.3-1.8w 445nm laser from sflasers a few months ago. It worked fine the last time I used it about 3 weeks ago. Today I put some freshly charged batteries in, turned it on, and got nothing. It has probably seen less than 30 minutes of total on time, and has never been on for more than 30-40 seconds continuous. Could the diode be dead already?