Powering Picade X with battery pack

I’ve been having challenges with using battery packs to power the Picade. It needs 5V 3A, but none of the 3 battery packs I’ve tried output 3A over USB A, leading to the lightning bolt. But it powers up.

When I connect USB C to USB C, I get no power. It’s like the battery doesn’t recognize that the Picade is connected.

I’ve tried different USB C cables and batteries, with no luck. Has anyone solved this?

I’m using the PiCade X, with a Pi 3B, and the 10" PiCade.

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Big fan of this product for powering even the Pi 4, does the job and great price. Haven’t tried it with the Picade X HAT but should work great. And having the power meter be a paw print is interesting.

I tried with a Portable Charger but when I start Retropie I always have a symbol at the top of the screen in the shape of a lightning bolt that warns me that the Raspberry is not powered well. This is the new undervoltage symbol, that means your Pi’s power supply is marginal or insufficient for its requirements. You risk damaging it.

Other solutions? Has Pimoroni never addressed the question?