Hmmm.
Let's start by not double checking the battery life in your dive computer until the afternoon prior to your scheduled dives. >

Note that I did give the whole octopus unit to the dive shop to inspect and overhaul in February. My fault for not checking the battery then, but still . . >
Let's add to that not paying attention to what bolt you're about to wrench on and breaking the thermsistor off of the retaining nut on your Ducati. :-X
Battery on order and dive reschedule for the end of the month and now I get to order a replacement thermsistor assembly on Tuesday.
Dunce of the weekend award goes to ME. Thank you very much. I'll be here all week.