How do those wire? Do you need a buck converter?
edit: ohhhh they have their own batteries 
That’s the thing I dislike the most about Shredlights. More things to charge. More microUSB jacks to break at the least opportune moment. More power switches to turn on before I can ride. More shit to turn off once I get to where I’m going. Shorter lifetime. Dead light batteries. Rain/mud/sand/salt/dust got in the fucking USB port. Again.
I want lighting to run off the main battery… if at all possible… like this…