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Since you know the PID of the offending process (4076), you should find out what started it. Run ps -aef --forest (as root, because it's a root process) and search for the PID in the process tree.
The keyword automake suggests it could be a software package being installed from source code.
Unless you observe this behavior right after a reboot, check out ...
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As I understand, spi.xfer2() takes a list that includes a COMMAND WORD, ADDRESS (24-bit by default), and DATA, respectively. According to Micron N25Q256A datasheet, one has to send the most significant address byte A[23:16] first and least significant address byte A[7:0] last (as opposed to the program that I took as a reference):
I've also noticed that you ...
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A 560mAh 3.7V battery contains 2.07Wh of energy. Given you'll need a boost converter that might be 85% efficient, that leaves you with 1.76Wh of energy. A RPi operates at 5V, and the amount of current drawn depends on the model and what it is doing. Around 400mAh is typical for a Pi3B not doing much, so that's 2W (5V * 0.4A). So your battery is going to last ...
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If we ignore Peukert's Law for the moment, each one of your batteries (3.7 volt 560 mAH lithium batteries) will run one RPi4b for at most 1 hour. Let's do the math:
RPi4B power consumption ~ 500mA (if lightly loaded)
Time = 560mAh/500mA = 1.12 hours
But this is unrealistically optimistic because:
You'll need a boost converter voltage regulator to get the ...
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If that is a rechargeable lithium, something like https://www.ebay.co.uk/itm/1PCS-5V-Micro-USB-1A-18650-Lithium-Battery-Charging-V0Q3-Charger-To-Board/402292719717?hash=item5daa83c065:g:uX0AAOSwx79evOvj should do the job.
I've bought some from one supplier (if you look around Ebay there are some providing a pack of 5) and they produce the expected 5V output ...
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