You guys are awesome. Here I was running in circles trying to find a solution to already having lights and no way to power them, and you guys send me in the direction of cheaper lights that already do what I want them to do (I found solar powered lights and a string of rainbow fairy lights that run on batteries and maybe I can wire them up to the solar panel too if I feel especially crafty) and are cheaper than what I already bought.
I'm glad I can still return the one I bought before, really, cause I should have thought this through better in the first place.
I kind of liked the idea of having a rope light wrapped around my bike, but the string lights will do much better in the long run.
Ooh, hey, I can use my big heavy car-jumper emergency battery pack and run the rope lights off of it to light up our campsite after dark, instead. Sounds like a better plan.
Thanks for pointing me in the right direction!