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My Raspberry Pi 3B+ is running Kali Linux on the official 7" display. I am using an Anker power bank that says: "5V=6A (3A max per port)" in the description. When using the Pi, it constantly shows the Low Power lightning bolt symbol. I plugged a USB Safety Tester between the battery and the Pi and it displays that the Pi is pulling about 1A when it shows the lightning bolt. Why is this happening?

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The "Low Power lightning bolt" reports low Voltage - nothing to do with current.

Either your power supply is inadequate or your cables are too thin.

See Raspberry Pi Power Limitations

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