Well i was completely wrong about using unprotected batteries.  The 5 Volt Detonator did nothing to stop what happened.  The vent holes may have helped to minimize the explosion but they did not stop it.  It was pretty bad, I come to the forum tonight humbled and regretfull I ever used unprotected batteries. 
 
OK so I had just gott some new Bright Blue CR2 batteries from Ebay.  They were only a week old.  They blew up and burned my leg, and scared the hell out of me.  I had the Detonator in my pocket and I must have forgotten to turn it off or maybe it was off, I'm not sure.   
 
Anyway " Boom" was the sound it made.  I didn't have a chance to do any thing.  The vent holes - did nothing.  I do not recomend using Un Protected batteries at all.  This could have been much worse if I was driving or holding it up to my face.  I have heard of some protected CR2's but I do not know if they will run the 510 atty that is in my Detonator.  I know some protected CR2's are out there and some are being developed / tested.  If anyone has more info about Protected CR2's please post it up here. 
 
I want everyone to be aware of what happen to me.  Be carefull and stop using unprotected CR2's immediatly.  This was much worse than I thought it would be.  The explosion went through my pants pocket , boxers and into my leg.  The JB weld nose cone held up fine.