I switched round the head & body of the RRT-2 & BC40.
What I've created is a pocket rocket and a long running work light.
RRT-2 XML can run on 2 x RCR123 so 2 x 18650 is not a problem.
The BC40 head does not light up with 1 x 18650, so I'm using 2 x rcr123 which works fine and gives full brightness. It's pushing the cells to their limit though so I've got some IMR 18350's on the way.
What I've created is a pocket rocket and a long running work light.
RRT-2 XML can run on 2 x RCR123 so 2 x 18650 is not a problem.
The BC40 head does not light up with 1 x 18650, so I'm using 2 x rcr123 which works fine and gives full brightness. It's pushing the cells to their limit though so I've got some IMR 18350's on the way.