Why is the command not working in cron?

Question

linux

Good afternoon.
There is ubuntu 20.04, in the root crontab (sudo crontab -e) added:

@reboot echo 60 > /sys/class/power_supply/BAT0/charge_control_end_threshold

On reboot, the command works (added test output to the file), but the changes are not applied.
If you run the command in the terminal manually

echo 60 | sudo tee /sys/class/power_supply/BAT0/charge_control_end_threshold

then the changes will be applied. Strange, but I remember that I noticed this with other commands, perhaps during the '@reboot' hook the system is not fully initialized, or something like that. Who faced this, tell me the reasons

UPD: After transferring to /etc/rc.local (there was no file by default, who needs to google it) it worked, though the GUI has a delay after turning on the system, it still shows a charge for 2 minutes, and then it only updates (if you check through the terminal, then the value is set immediately)

Answer 1

maybe during the '@reboot' hook the system is not fully initialized,

I think this is the reason.
Run in rc.local.

Answer 2

There is no PATH in the cron.
Write the full paths to any command that you have "and manually executed."

Answer 3

Because it is necessary to reload Cron:
sudo /etc/init.d/cron restart