My current means of powering things is USB rechargable batteries. I have a about five of them that range between small 3000-5000mah ones to a big 20000mah interstate battery jump starter pack. Is there a device that lets me add all their power together into a centeral power source so I don’t have to keep swapping them out?
I’m assuming you mean USB powerbanks.
I’d be surprised if there was such a device. It would require somewhat sophisticated electronics to work well, and the market for it would be small. A design that didn’t result in power cutting off during the switchover would need to keep at least two powerbanks active at a time, and that could negatively impact efficiency since the electronics in the powerbank consume power when active even under light loads.