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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.
Or, I mean, it could just wire all the positives together and all the negatives together and hook that right into your target device.
It'd be the same output voltage regardless. A little less internal resistance, and lower step down in the later phases, but neither should make a difference in what you're powering.
Kinda like how there were those converters for the GameBoy back in the day that let you put C batteries into it. Same principle.
So I could actually get a couple of old short usb cords together cut the ends off, strip the positive and negative wires and hook them in series without it changing the output voltage?
No...please do not do this.
The voltages of the output ports are probably not all exactly the same and you could end up damaging the device (or worse, starting a fire). They MIGHT have reverse current protection on them, but I've seen some pretty sketchy power banks.
You can't just wire them in parallel. USB has communication pins that help boost circuits in the battery change voltages levels. Even if it all works, you're going to get extremely poor charge times.
I don't believe it's out of the realm of EE to design something that allows you to plug in multiple power banks though, but I've never seen any