You could buy a power inverter so you can pug it in just like a cout outlet. You can pick one up at any auto section in any major store (wall mart etc) for around $39 Thats how i use my ps2 in the car works great.

97 Eclipse GS
Aem CAI, Obx 2.5" Stainless Cat back, Tomm's coilovers, Blown stock struts , Black housing projectors, Blitz Body kit, Dark blue metallic paint, Alpine cva-1005 head unit (6.5" indash monitor), Playstation 2, Alpine ai-net 6-disc changer, Alpine type-R 6.5" component set, boston acoustics 5X7" in the rear, 2 alpine type-r 12"s Pheonix gold sub amp and eclipse 4 channel.

97 Eclipse GS
Aem CAI, Obx 2.5" Stainless Cat back, Tomm's coilovers, Blown stock struts , Black housing projectors, Blitz Body kit, Dark blue metallic paint, Alpine cva-1005 head unit (6.5" indash monitor), Playstation 2, Alpine ai-net 6-disc change