Custom lamps system with detachable battery box
 

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robalong , you might ask a moderator to move this thread to the Electronics and Lighting subforum. You might get more responses there.

Well, each to their own, of course. But nowadays there are so many really good, completely self-contained, rechargeable lights that will go for hours between charges that what you are proposing seems like a lot of work for no appreciable gain. If you were thinking about really powerful lights for seeing with it might be another matter. My Cateye Rapid rear light runs for two weeks or more of my commute, amounting to around 10 hours per week. My front light is a very beefy one so only does two days but I'm sure you could find a front 'flasher' that would last a similar time and be almost as compact as the Rapid.

If you're determined to go ahead with your scheme there are some very neat solutions for that too. One I've seen involves feeding cable up the steerer tube and replacing the cap on the steerer with one that includes a USB socket, so you plug your light into the USB socket. I guess it's probably designed for a dynamo as feeding a cable from the saddle would involve going down through the bottom bracket and then coming out under the down tube. Very hidden, though.

I feel it's my civic duty to elaborate on the above. This is a mere 500 lumens in total darkness on a wooded trail. USB rechargeable. Lasts for an extremely long time on flash mode. Also has two steady brightnesses. The giant porcupine heading towards me just before I snapped the photo was able to see me and veer off into the woods.


https://cimg3.ibsrv.net/gimg/bikefor...10a2656699.jpg

Looking at the web site, it lacks any electrical details/specifications that one would help determine its suitability for OP's plan for battery charging. The lamp and "dynamo" are integrated. Attempting to tap into one of these units to run wires and reworking the case to be weatherproof again would be very difficult without possibly ruining the unit.