/etc/acpi/events/battery is in acpi-support 0.142-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # /etc/acpi/events/battery
# Called when AC power goes away and we switch to battery
event=battery.*
action=/etc/acpi/power.sh
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