I saw a tip on the fediverse which, annoyingly, I cannot now find. If I do find it, I will link it here.
Basically, it said:
Have a look at
TLPfor improving your laptop’s battery life
According to its documentation
TLP is a feature-rich command line utility for Linux, saving laptop battery power without the need to delve deeper into technical details.
I installed both TLP, and the optional Radio Device Wizard package, with:
apt install tlp tlp-rdw -y
Looking at GNOME’s battery monitor immediately before and after, the predicted battery life for my machine jumped by just over 50%.
I’ll have to see how it pans out but, if it’s anything close to that, wow, what an improvement, for one simple command.
Thank you linrunner!