01-02-2019 10:37 AM
The battery is holding its charge overnight after modifying select factory-set camera features.
To reduce battery drain when leaving the camera turned off for an extended time (overnight or longer), turn off voice control in addition to GPS, WiFi and LEDs. GoPro support also suggested removing the SD card.
I found the voice control tip through an external blog. A suggestion might be to include it in the GoPro manual.