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Is it yet feasible to use a USB powerbank to power the Raspberry Pi 4B? Are there any that you've successfully tried and could recommend? Can a 2.4A USB-C bank work?

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The Raspberry Pi 4 spec recommends a 3 A supply (15 W), with a minimum current of 2.5 A if downstream USB peripherals consume less than 500 mA in total.

Furthermore the MagPi benchmarks a power draw under load of 7.6 W "running a CPU-intensive benchmark while an HDMI display and a USB keyboard and mouse are connected" (note that they do not state the use of any on-board peripherals, such as GB-Ethernet, WiFi, or BLE). 7.6 W at 5 V is a current of 1.52 A.

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Considering the data listed above it seems rather likely that a Pi 4 can be powered with a solid 2.4 A power bank (if no additional power hungry peripherals are connected) even though it is below the recommended ratings.

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The recommended current requirement for Pi4B is 3A, so 2.4A power bank is rather not enough, and the pi could be unstable on such power supply. You need a powerbank that can supply at least 3.0A, then it will be perfectly fine for powering up the Pi4B.

  • That is not the minimum requirement, it is recommended if you want to power the PI and some USB devices. – RalfFriedl Jun 29 at 9:33

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