i also don`t think that you can find something which is noticeably warm this way - 4% of your battery in 12hrs - that "hot spot" should be hard to identify - and opening notebooks for getting access to the all parts of the mainboard may be hard/dangerous.
if your notebook powers down and doesn`t show that something is still "on" and consuming power - i`d call that "broken by design".
it should not be up to the operating system to make sure that all parts of the hardware are switched to off.
if i power down some device and there is nothing showing "hey, here is something active" (e.g. by some led or lcd) - i expect it to stop consuming power.
maybe it`s not that broken as my PC, which is consuming 20W after power-off (due to power-supply) - but i really would go ask the vendor and first complain there.
they should know the details.
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