The minimum power supply is dimensioned to allow for USB powered peripherals.
The idle power consumption of such a SBC like Radxa X4 must be significantly below 5 W, probably around 2 to 3 W.
That is still too high for standard AA batteries, but rechargeable batteries should work.
If a long battery life would be needed, it is likely that one can shut down the N100 CPU and wake it up either periodically or on USB activity caused by the RP2040 MCU. That should reduce the average power consumption to fractions of a watt.
The idle power consumption of such a SBC like Radxa X4 must be significantly below 5 W, probably around 2 to 3 W.
That is still too high for standard AA batteries, but rechargeable batteries should work.
If a long battery life would be needed, it is likely that one can shut down the N100 CPU and wake it up either periodically or on USB activity caused by the RP2040 MCU. That should reduce the average power consumption to fractions of a watt.