hmmm, Okay I can bike better than I can do electronic hook-ups. BUTT, I have a friend who loves these things and this would be the info he needs to help me. I like the idea of still using the original battery and the AA as a switch over for back-up.
Questions;
a) Do you think the run time of the 4 x AA would be 50% of the brick?
b) Is there a DIY way to adjust the light output to a lower power output or even a flash mode.

Thanks

Rob