>>1494431Build your own. Try not to start a fire.
I still need to get back to my spot welding project and get that working properly. I was thinking about trying to grab a bunch of dirt cheap batteries, boards, and possibly USB cord from good ol’ China and build some duct tape wrapped disposable power banks that could be sold for $5-$10 at festivals and shit. I bet they could be built for <$2 in materials if some real cheap 18650s could be found and ordered a couple hundred boards.