Because how can ypu POSSIBLY TRUST A USB POWER BANK? Those things are reptilian interdimensional seed phrase transmitters. Jack Kruse told me so.

You need a 9 volt to run a cold card?

No it's just some silly overpriced CoinKite tchotchski you dump in ypur cart when you're ColdCard shopping. A little circuit with 9v terminals that can deliver power to your device.