Defragging a potentially huge disk, in the background, on-the-fly, so the disk never slows down.
Why on earth would it do this while on battery? Can't it wait until the machine is plugged in again?
File search index, in the background, on-the-fly, so you can search faster. You can turn this off.
Again, why do this by default when on battery?
Full window dragging, and many other graphics enhancements. You can turn these off.
This will have almost no impact on battery life unless you are spending most of your time dragging around windows for your own amusement.
Is the printer still there? Let's check again.
Why? If I'm not trying to print anything, who cares if the printer is there.
Port polling, did you know that a USB port might gett polled 50'000 times per second? You can turn this down. A lot.
Why default to such an aggressive polls/second while on battery?
Scheduled tasks. Oh so many scheduled tasks. You probably have over 1'000 defined.
I certainly didn't schedule over 1000 tasks. Why are there over 1000 tasks scheduled and why are they scheduled to run while on battery?
Is the internet still connected? Let's check again.
Why? I'll know as soon as a webpage can't load.
An actual software Firewall. You can turn it off, or make it much simpler.
If this has any effect on battery life then it is horribly, horribly written.
Multi-user, multi-profile. Everything gets doubled.
You have multiple users logged into your laptop while on battery? Sure, it's possible but, I find it highly unlikely that most people do.
Is the printer still there? Let's check again.
Is the internet still connected? Let's check again.
See above.
Event logging. Windows knows what it's doing, because it takes the time to write it down.
That's the only potentially valid thing you've said so far. Well, the first sentence at least.
The windows registry. It's probably the single most reliable aspect of any operating system. It's incredibly fast, always-on, used tens of thousands of times in a single moment by a any application -- my graphics suite writes 12'000 registry entries when I close the application. And you never need to worry about it getting corrupted.
At this point I'm wondering if this is actually a troll.
No fewer than eight different scripting languages available at any moment.
I don't see how this could affect battery life at all.
Twenty versions of a single DLL loaded concurrently, for cross-decade application compatibility.
Except for the disk access to read the DLLs, just having them in memory makes no difference at all.