TX2, using Jetpack 3.3 and L4T 28.2.1
I do not have physical access to the devices that I need to update.
I have tried to follow the instructions at Deactivating RTC Battery Charging.
I am able to remove the device tree node indirectly by modifying the kernel to not load that node. 
But as far as I can tell, the
tegra186-mb1-bct-pmic-quill-p3310-1000-c04.cfg file I change modifies the mb1 bootloader, which I am unable to update remotely. Is there a way to do whatever change the pmic configuration file does, but in the kernel (or some other remotely accessible part of the system)?
 I do this by modifying the
max77620_init_backup_battery_charging function in
 the /sys/kernel/…/registers file shows that the
04 register is set, at least.