/etc/acpi/actions/lm_battery.sh is in laptop-mode-tools 1.66-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #! /bin/sh
test -f /usr/sbin/laptop_mode || exit 0
# Automatically disable laptop mode when the battery almost runs out,
# and re-enable it when it
/usr/sbin/laptop_mode auto
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