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Wow this is great, learned a number of new things! Only a bit confused about your remark about dark mode. Afaik it does not improve battery life on (most) LCDs because of their uniform backlight. On the contrary, I often find myself increasing the brightness a bit in dark mode which obviously consumes more energy.
Is there a reason the battery is plugged in first upon reassembly? Usually the battery should be plugged in last in my experience.