[ltp] self-made external battery for laptops project

[Richard]

Just in case anyone is thinking of making a DIY adapter from the car
cigarette-lighter socket, it might be worth mentioning that, when the
engine is running, its '12V' supply isn't.

It may be as high as 17V (with the alternator charing the car battery). It
can also have lots of nasty spikes!

Really this is just advice to think twice before you plug your laptop
into your car with an own-design psu, and the engine on. It's probably OK
in most cases, though.

Richard







On Fri, 19 Apr 2002, peter nol wrote:

> Thanks Bart
>
> .
> Well at least that means that the UPPER voltage is flexible :)
> the markings on the original ac adapter say
>
> 16V 3.36A
> Your experience tells us that the requirements for the upper voltage are
> flexible.
> Now to find out if anyone has tried lower voltage and i'm ready to go.
> They got 12v batteries starting with as low as 15 dollars :)And then of
> course there's the car battery. i'll bet that one will last at least 20
> hours. A tad heavy to carry around in your backpack though.
>
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