Pay attention...
In the case of a laptop it's different...
Not particularly- laptops still have CMOS batteries.
my old thinkpad has three batteries (well, ideally) a main battery (which exploded) a standby battery (which also exploded) and a CMOS battery, which thankfully has not exploded.
I use exploded with some hyperbole. They just sorta started leaking.
For laptops, most of the password advice is sound, of course, the password may just as easily be a HD password, which would immensely complicate things.