A coworker of mine has a T5 with 3 C123 batteries.He asked me today if it was normal for the batteries to totally drain after 60 days.I said in my opinion no,I have a TK40 and a D10 and my lights have worked for months.I told him to put fresh batts in and check it again in 60 days and check.He stated he had twice before with the same result.I then told him to Inova to see what they say,I was wondering what everyone's experience or opinion is on this.