auto adapter for G4 Powerbook

That will work, but only with small devices, but your power adapter will be fine because it is convering back to low voltage anyway.

It's probably a third party power inverter

The Kensington model you are linking to seems like a standard unit - I'm not sure what it's rating is (measured in Watts), however, and this is critical.

I have a 175 watt model from xantrex (Their "Micro-Inverter 175) and it drives most small appliances.

The problem is that these inverters generate heat as they step the power up to 110 V (assuming you want a 110 rather than a 220 V inverter), so they need a decent micro fan to cool themselves before they burn out. (The irony is that your Powerbook power adaptor generates MORE heat as it steps back down!)

Here's a link to a company that supplies the full range of power inverters - get the one that suits your needs, and froogle it for a good price:

http://www.xantrex.com/web/id/17/p/htc/pt/5/product.asp

All-Battery.com would be a good place to look (as evidenced by a Google ad on this thread). I poked around and found some interesting things that might help you.

TEG

I just bought an adapter a couple of months ago and it seems that my 12 volt system in my car has some problems powering my PB. I read somewhere that for max. performance power-wise, the cables need to have a certain diameter in the car. Otherwise you'll experience power loss.
So, when you buy a power adaptor, make sure that you can return it if you have problems.

you should be fine with almost anything

the powerbook charger is one of the lowest watt laptop chargers I have seen (its 45 watts). So as long as the adapter is rate for at least 45 watts you should be fine. Also I don't think there are power adapter you can buy now that are rated lower then 45 watts so almost any of them should work.
As for that one you linked to, I have heard good things about it and they have it for sale at the apple store if you don't want to have to wait for shipping. I personally use a more expensive one $100 i think, Its called the iGo juice and its specially made for laptops and acts as the power-charger it self so don't even have to bring your power-charger that came with your powerbook. If you don't want to spend a lot of $$$$ then just get that one you linked to.

my new powerbook uses a 65W charger... they used to be 45W. not sure if that makes a difference. i haven't charged the powerbook in the car, though i did charge my ibook using an inverter i bought at walmart (oh, the shame!) on a cross-coujntry trip.

bb

betsbillabong said:

my new powerbook uses a 65W charger... they used to be 45W. not sure if that makes a difference. i haven't charged the powerbook in the car, though i did charge my ibook using an inverter i bought at walmart (oh, the shame!) on a cross-coujntry trip.

bb

Click to expand...

The 17 and 15 inch PowerBooks use a 65W power adaptor, because of the higher rated batteries, and higher power consuming components (screen etc) compared with the 12 inch, which iirc uses the 45W adaptor.

Just save up for a real car adaptor .. all the fuss of using two adaptors just isn' worth it .. http://www.madsonline.com/index.html?matrix2.html~mainFrame

Mertzen said:

Just save up for a real car adaptor .. all the fuss of using two adaptors just isn' worth it .. http://www.madsonline.com/index.html?matrix2.html~mainFrame

Click to expand...

Except that you can also recharge your cell phone, your digital camera, and your other battery powered devices off the power inverter ...

paxtonandrew said:

The 17 and 15 inch PowerBooks use a 65W power adaptor, because of the higher rated batteries, and higher power consuming components (screen etc) compared with the 12 inch, which iirc uses the 45W adaptor.

Click to expand...

The TiBooks used the 45W adaptor. All the new Aluminum PowerBooks use 65W adaptors. You can use a TiBook's adaptor for a newer PowerBook, but if you try and use it and charge it, you will just drain the battery slowly. It needs to be asleep/off to charge off of the 45W adaptor.

But yes, I just checked and my 12" PowerBook's adaptor says "45W" on it.