> I was reading all this car power stuff, very interesting, and I was
wondering
> Can I connect my notebook to a car battery without risk?, with kind of
circuit
> can protect so sensitive device to a car battery?, I was thinking in a
switching
> inverter, I found a couple of these on the market (my notebook has only
> 90-260 AC
> input built in PS), but I think that connect it will be very risky if the
car's
> engine is turned on.
> what do you people think about it?.


Some companies make Dc-DC converters for this, they are safe, and more
efficient.
Myself, I use a 100W inverter, and my notebook's regular charging brick.
It's hard to imagine how a spike would get through all that, and the brick
has to take whatever may come on the AC line anyway.