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OK, here are the results:
poweroff -f -- causes instant shutdown with the last screen displayed but in inverted color. Power button press causes instant normal boot.
halt -- causes shutdown after a delay of ~2 seconds. Screen displays "Please wait....". Power button press causes a momentary green flash, followed by 3-5 minutes without any visible signs of life, followed by normal boot.
shutdown -P now -- causes shutdown after a delay of ~2 seconds. Screen displays "Please wait....". Power button press causes instant normal boot. (1 out of ~5 tests required a second press of power button to boot the device.)
So I am now using @ilovejedd's command in the halt script.
@NiLuJe - I shutdown my devices if I expect not to use them for a few weeks.
As far as battery use, I did some testing a few years ago on my devices K4-PW2. The battery drain was 1.25%-2.5% per day in sleep mode. My old K2 only lost 0.25%-0.5% per day. I did not test PW4 and KOA2 with the power saving mode. A normal reboot of PW4 consumes about 1% battery.
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