I'm trying my hand at building a portable NES and it's coming along nicely...the only issue I'm really having is the battery. I really am unsure of how to do a rechargeable battery or even what kind/how much power I need. I'm using a psone screen as the screen and will modify the screen with LEDs to save on power. I'd like to get at least 3 hours of play time on the portable, but I'm definitely stuck. Can anyone maybe point me in the right direction as far as what kind of batteries I need and how to go about building a recharge circuit?