Portable GameCube and N64

[Crisscrosscory1]

I am making a portable GameCube but I have ran into a wall I have no clue on what kind of rechargeable battery I should use.I look all over the internet and i have read about the batteries that others have used but they say it last from 45mins to an hour and a half.I was hoping that some one could help me find a battery or batteries that at least last two hours or more.

Screen:
Audiovox model no.: EX50
Power source:
DC 9V

Screen AC Adaptor:
Input: 120VAC 60Hz 13W
Output: 9VDC 800mA

GameCube:
Rating: DC 12V 39W

GameCube AC Adapter:
Input: AC 120V 48W 60Hz
Output: DC 12V 3.25A

I am hoping that i can use just the GameCubes power supply to charge the system.

I'm also doing a Portable N64 at the same time (different systems not in the same one) and the same issue is with the rechargeable batteries. I would like again to have something that will last at least two hours.

Same Screen as the other one.
Screen:
Audiovox model no.: EX50
Power source:
DC 9V

Screen AC Adaptor:
Input: 120VAC 60Hz 13W
Output: 9VDC 800mA

N64:
Rating: 19W

N64 AC Power Supply:
Input: 120V 26W 60Hz
Output: DC 3.3V 2.7A
: DC 12V 0.8A
and again I would like to be able to use the N64 Power Supply to charge the system.

Thank you to everyone how helps me.

[windwaker]

i dont think the n64 power supply will work and multiple batteries might be cheaper i found some in a thread but ill have to find them again

[hailrazer]

If you use Li-po's or Li-ions you can't use the Gamecube or N64 power adapter to charge them. You will need a smart charger and a protection circuit.

[Crisscrosscory1]

thank you, for your help but, Im sorry if I did not state that I am some what a new at this I was wondering what is a smart charger and a protection circuit and where can you get them. Oh and hailrazer i have to say is seen your videos of you portable gamecube and nintendo and thats what got me going these. I have aother question (what type, where to get them, and how many) batteries do you think I need.

[gamemasterful]

Check the forums and links. There's an entire topic devoted to batteries.