You can do it but it would be very costly, not to mention time consuming. You would have to step-up the voltage of you battery to give the ps2 120v - you would need to make/build a small transfomer. It is much better just to go and get a power inverter and that will save you time and money (electrical parts are expensive). Make sure you get a power inverter that has at a bare minimum 150watt power handling. You can wire the power inverter directly to the battery -- just make sure you have a fuse inline, and you mount the unit inside of the car. Hope this helps!
ya man just get a power inverter. I just got one off ebay that you can either hook up to a second battery in your trunk or plug into your cig. lighter. It was like $40 inc shipping. 350 volts, and 2 outlets built in. I'm just getting started with my electronics in my subaru. I'm hoping to have a ps2 and 3 tvs hooked up along with a tv tuner.
Good luck on your "quest for glory"
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