I have extremly short runtimes with my bb750.
"extremely" means that with a pack of fresh batteries regulation falls out after ~2 minutes.
I tried 2 different high-quality sets of batteries.
If I switch of the light, after it gets dim, and then restart it, it even lights up for only 10 seconds.
[img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img]
Pennies havent been made out of copper for a long time they are actualy copper plated zink. Would just hate to see someone go through all that trouble and then find out [img]/ubbthreads/images/graemlins/icon15.gif[/img] with that being said that heat sink looks AWSOME. I gotta have one!
I simply potted the hole thing in arctic-alumina, and then fixed it at the aluminium on the inside of my 3d-mag.
The contact-area is pretty small, but obviously it is enough to run longer than 6 minutes (didn't have more time to test)
It's the copper slug for mounting the 5W. The only thing making contact is the tallest component on the board. I think it's a resistor??? (Not to sharp with electronics [img]/ubbthreads/images/graemlins/grin.gif[/img] )