Gust, I didn't mean to put you off from trying PD power banks. They do work quite well. I and others on this forum are using them successfully. All solutions have quirks. You just need to be aware of them. The advantage of a power bank is that you can also use them to power other equipment with different voltages and connection types. It's a versatile and flexible solution.
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73, Dan - W2DLC
Daniel Conklin