All of them use a USB port to charge. It is up to you to obtain USB power locally. How you do that is your choice. You may
Neither! Or both! Depending on what you like more.
Powerbanks are charged and discharged via USB (cable). And USB has 5V.
I don’t have that much experience in power banks but I have yet to come across one that is fed mains voltage at all. All power banks I have seen to date are charged via a USB cable supplying them with USB voltage: +5 V DC.
All wall chargers for power banks I have seen to date are in fact mains to +5 V DC converters; they typically don’t even try to hide the fact by simply supplying a USB out socket (and in fact many if not most power banks simply come with a USB cable, not one for mains).
Since the 120/230 V AC mains voltage is scruntched to DC before any power reaches even the cable to the power bank, you need not worry.
All the devices you mentioned charge via USB, so really all you need to do is carry a USB wall adapter, that is compatible with USA / UK voltages.
I carry with me a macbook pro lightbar 2016 wall charger:
Easy to adapt to any wall adapter, since it comes with multiple wall heads and these are easily found in most local shops.
Has universal voltage support.
Has a removable USB cable; which means I can plug in (with a suitable adapter) any USB cable to charge any kind of device.
Supports “fast charging” on mobile phones that support it, since it has a higher amperage output.
I am talking about the 87W adapter (link at apple.com).
The good news is that from the last 5 years or so that I have been buying gadgets, all the chargers that I have bought – including laptop chargers with USB ports, cell phone chargers, smart phone chargers, wall adapters, multi-plug ports … are all dual voltage.
If that fails, you can always charge those devices from another USB host, like a laptop or desktop computer.
Credit:stackoverflow.com‘
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