Hi Valmet62 - I can't answer your question, but if he doesn't happen upon this thread and give you an answer, you should PM FlashCrazy. I'm sure he could help...
Hi guys, I'm not sure if it'll work in the V4. I'm tempted to say no, because from what I recall the 2SM module was used in a CL1H that used a positive grounded housing.... the battery had to be put in backwards (positive end towards the tailcap).
Right, like WadeF said the V4's head isn't meant to twist to change modes like the earlier 2SM. But as far as the pill itself goes, I'm not sure if it will work in a V4 (and using the tailswitch to change modes).