/etc/default/anacron is in anacron 2.3-20ubuntu1.
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 6 | # If set to "yes", start anacron even when on battery power. By
# default, the /etc/init.d/anacron script tries to avoid running
# anacron unless on AC power, so as to avoid running down the battery.
# (Things like the locate updatedb cause a lot of I/O.)
ANACRON_RUN_ON_BATTERY_POWER=no
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