The battery will be used for trivial things like the real time clock and the circuit to wake up the machine. There are few if any models that draw zero power when "off" for this reason.
There's also some issue with the battery level reporting. It's rarely that exact. This can really irk folk that want perfection.
I'm not there to check your settings as to what the power button does. Check it now.
Finally, to extend battery life, many systems today let the battery fall to 80 or 90% before charging up. This might be controllable but sometimes not. Check your manuals or ask the maker.
Ever since the Win 10 Fall Creator's Update 1709 my tablet appears to boot too fast as if recovering from sleep or hibernate mode after what should have been a full shutdown.
This seems to be confirmed by battery drain which, instead of showing the full 100% shows 97% even after a full charge.
What happens is I plug in the charger overnight. Then unplug in the morning when the battery should be 100% charged. Then when I power on an hour or so later, it boots quickly as if coming out of sleep or hibernate and the battery shows a 97% charge. There's no HP logo splash screen or Windows dot circle.
Subsequent boots behave normally.
I've changed every power/sleep setting I can find to "never" or "off". "The "Fast Boot" option in the BIOS is also off.
Can anyone suggest what I'm missing? I don't want the PC to be draining the battery like this when I'm not using it.
I'd appreciate any help.