Well, I sent them an e-mail and they responded with:
"At this time were unaware of any units draining batteries when shut off, that said we have had reports that turned into situations where the customer was just pressing the on off rather than holding the power button to turn the unit off. If you are sure you are pressing and holding the button to turn off the unit then it may have a problem. If you just press the on off button all it will do is turn off the display to save on battery life when you are in the field, the unit will still be on and using power.
If you feel you are using the unit properly then please fill out the RA Request form at the link I have supplied below so we can get the warranty process started."
I spent a good bit of time this weekend trying to figure out the pressing vs holding the power button down and couldn't find the "display off" setting. Which would be a very nice option to have in a mono and scopes as far as I'm concerned.