Is it safe to plug in?

I live on a farm that has less than desirable power, that is why i bought a laptop.
i can charge cell phones, run a fan, or listen to a radio; however, brownouts (a drop in electrical current) have destroyed products with moving parts like cd players, and tape decks. i usually plug my laptop into a power converter in my truck which is incredibly inconvenient. my questions are (A) wether or not if the computer is OFF can i charge the battery. and (B) if i run the computer plugged in and the power drops(brownout) will the battery take over running the machine without any problems? Any help or insight on this would be greatly appreciated.
thanks,
derek
g4 powerbook Mac OS X (10.4.2)

A) Yes you can although your PowerBook, and also its adapter, will make certain assumption with regards to your electrical supply so damage can occur if you have seriously bad power.
B) The brownout is where the vast majority of computer related incidents, like data loss, is caused. Yes the PowerBook will switch to battery if it realises it isn't getting enough power although how intelligent this is is not clear. Just like using a 45W adapter the damage it can cause your PowerBook and battery is unknown.
Why don't you just buy a UPS? It will solve all of your problems with power. A line interactive model is highly recommended as it will do on the fly topping and tailing of voltage. Try APC…
http://www.apc.com/products/category.cfm?id=13

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