halocline
Contributor
As others have said, if the only reason you want to turn it off is to save battery power, I would not worry about it. First, the battery in those things lasts forever it seems, and second, I bet if you could figure out a way it would make almost no difference in the number of dives you'd get out of it before changing the battery. 200 dives at $4/battery comes out to a whopping 2 cents/dive battery cost. If you were somehow able to double the battery life, which I would bet is impossible, you'd save 1 cent per dive.
Not the best money saving plan
Not the best money saving plan