thanks Ramblings, and I suppose something wrong with your Roche… I’ve already wrote about RM170 in this topic , so below I will just copy and repeat some points;
in my NW version batteries fits and works any what I have, longest protected battery - 69.5mm, and I don’t think that 70mm will make any problems to fit RM170 - did the test with protected Trustfire(~68.70mm) with adapter for flat tops(~2.18mm). this made almost 71mm, and it works! so… maybe necessary to screw deeply driver(ring around driver) in your RM170 head? I don’t know, it’s just my thoughts…
and it win battle with SRK in any way - longest distance, more bright and focused beam. sad what I don’t have good camera to take some good beamshots/photos(woods starts just from my home), my poor camera can’t take pictures at night in any way 
I’m waiting second RM170 from Ric/CNQG for my friend, with CW diodes and 3 modes. and CW SRK available for comparing also… need to find good camera that can work at nights 
modes… it’s very simple after understand how it works;
1. long press button for turn-on the flashlight(max brightness), after that
2. twice press switch – go to low mode, or
2.1 thrice press switch – go to SOS mode, or
2.2 press and hold switch and flashlight will go to stepless mode(100% – 5% with memory)
from low mode;
3. twice press switch – go to strobe, or
3.1 thrice press switch – go to SOS mode
in strobe or sos modes;
4. continuously fast press switch and flashlight will change modes like: strobe-high-low or sos-high-low.
I suppose you need to send your copy back for replace, one person in RF got RM170 with similar problem, here you can read topic(translate it with Google) and see the photos of disassembled head/driver of Roche m170. hope you will get your new RM170 fast and will not disappointed!