I would appreciate it if you could answer the wrong question.
SPRESNESE officially lists inputs to the microUSB terminals on the main and expansion boards and the Vout pins on the expansion boards for power feeding methods.
If I connect the microUSB terminal to the PC while supplying power to the Vout pin from the battery, will it work properly?
My personal prediction is that there is a possibility of failure due to the dual supply of power.
I look forward to hearing from you.
spresense
I didn't look at the SPRESNESE schematic, but I guess the comments suggest that the USB power supply and Vout are directly connected.
Assuming that,
If both are supplied at the same time, nothing will happen if both are at the same voltage.
However, if the order of power-on is different or the voltage is different, it is possible that the current flows from the higher voltage to the lower voltage without limitation.
Well, if it's a decent power supply, the protective circuit works and nothing happens, but otherwise it can lead to failure
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