I just bought a Minox GTE. I cannot find any on/off switch to turn off the camera. The owner's manual does not indicate any on/off switch. The owner's manual does advise "Closing the front cover in intervalls (sp?) between shooting reduces battery drain." So I assume there is no on/off switch. Am I correct? <p> I do have an old SLR with needle light indicator, and the battery does drain rapidly if left turned on. So, how long will the GTE's battery last with the lens cover closed? Should I reverse the battery polarity while not in use, as what I usually do with my flashlite?