Using lighter adapter as power source safe for MBP?

Hi everyone,I had a question about lighter adapters for cars and using my MBP with them. I'm scheduled for a 14 hour road trip on Thursday and have a lot of work to do that requires more than the three hour battery life that I get from my Mac. My brother has a lighter adapter that acts as a "wall outlet" in that you can connect your AC supplies to it, etc. This is all well known probably. But my question is this, is it safe to use these adapters (I don't want to blow up my computer or mess up the battery) and does anyone have any experience with them?
Thanks in advance.

I don't know what a magsafe is. My wife bought this for another purpose: http://catalog.belkin.com/IWCatProductPage.process?Product_Id=122461
Can I plug my MacBook Pro power cord into it and use in the car? Or do I need to go to a mac store and buy something from them?
Thanks,
Steve
iBook G4 Mac OS X (10.4.7)

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Done...
JAG,
Please let me know if anything needs changing or you don't like something...lemme know in PM's or something, half the time I can't even get in this forum to do anything productive in the morning hours :(
I'll have to catch up with the Good Articles forum Mods to update that one..
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https://sites.google.com/site/lapastenague/a-deconstruction-of-routers-and-modem s/apple-time-capsule-repair/repair-type3
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Using lighter adapter as power source safe for MBP?

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