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?
Plug the charging port of one into the next one?
That can work, but since the batteries are at roughly 3.0-4.2V depending on state of charge and standard USB power is 5V, that’s a whole lot of steps up and down. Each one takes an efficiency hit. The last one in a series of five would likely waste the majority of its energy.
They typically won’t provide power while taking in power.