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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4 Answers
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.
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.
I am running a pi4 with v2 noir from an old 10.000 powerbank.
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.
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3That is not the minimum requirement, it is recommended if you want to power the PI and some USB devices. Jun 29, 2019 at 9:33
On the official raspberry pi power cord, it shows a 3A⎓5V sign, so I think any power bank with 3 amps and 5 volts would work, just make sure to save work and shutdown the raspberry pi before the power bank runs out, or you could lose your work and/or have the microSD card corrupted. (I want to make a portable raspberry pi 400 desktop setup)
