As per subject, I basically want to set up a laptop so it powers directly off the car battery. These are old laptops, not some new models that I can go buy adapters etc. Budget is minimal, very minimal.
Previous attempts to just add 12V to + & - terms on laptop battery have not been successful. Obviously that string of pads between the + & - are significant. Opened old IBM & a Toshiba battery packs and found that each have circuitry.
So, easy way, I was wondering if anyone could give me a heads up on what they do? I wonder if there is a standard anywhere.
Otherwise, it is back to the drawing board and circuit tracing.