Mostly pen-testing distributions have the same issue they consume more battery power. There are a lot of things that we can do to lower the consumption of battery power most of them we already know like

1. Putting our computer to sleep when it is inactive.
2. Setting our computer to hibernate mode when battery power is low.
3. Slowing down the hard disk spin.
4. Putting display to sleep when it is inactive.
5. Reducing the back light brightness.
6. Dimming display when the computer is idle.
7. Turn off WiFi when not required
8. Kill all unwanted processes
9. Hard disk power saving option (hdparm -i /dev/sda if AdvancedPM=yes then hdparm -B 1 -S 12 /dev/sda)

But one more thing we can do and that is

Enable Laptop Mode

We can save our battery energy life by turning on Linux’s laptop mode. Remember not every hardware comes with a laptop mode so we need to check whether our hardware supports laptop mode by executing the following command under root:

nano /proc/sys/vm/laptop_mode
If you find that the value in the laptop_mode text file is 0 it means that the laptop mode is disabled. Just set it to 5 and save the file to enable the laptop mode.