The V3 is vented for sure. I cannot say with 100% certainty but I believe the ICON is as well. Also, here is quote from Steve at PS on 7-23-10:
"AW14500 WILL Fit. Last week, I made a small adjustment to the hex shaft to see if we could accommodate protected batteries. It wasn't much due to the fact that if it was TOO much, no batteries would work.
So, This is the Breakdown.
The ICON Ships with 3 flat washer, no lock washers. Use it how it is with 3 washers with Tenergy/Unprotected 14500 Button Top Batteries.
Now, to use Protected Batteries (at least the AW14500's I have here), you will need to REMOVE all (3) washers, and screw the electro nickel plated screw down to the plastic.
So, there ya have it. The jist ...
3 Washers = For Unprotected Batteries
0 Washers = AW14500 Batteries (can't comment on other protected 14500 batteries since we have none to test)"
You can see more here:
Icon news -- 7/23/2010