Hi!
I had always thought of having headlight for my KTM ecross that doesn't need a separate battery. Actually I found it is relatively easy to do.
1) Super cheap 5v headlamp - 6USD, declared as Hot 3000LM CREE XML T6 LED
2) Pair of connectors - HR30-6J-6P (71) and HR30-6P-6S (71)
3) 5v+ from...