There are some Hand Held Consoles out there that will play your Nintendo NES games, but none that I would recommend right now. The best off them have a play times of only a few hours before you need new batteries and none of them offer a rechargeable battery pack or even a power cord so you could at least plug it in while you play.
There are rumors of a new hand held comming out in March that will have all the thing we want. Rechargeable battery pack, longer life span before we have to charge it and will play all your old NES and SNES games. These are the things we know, but we have some unanswered questions. Will it have a power cord so you can play while you charge? Will play every NES game or have the same limitations as the FC twin? Will the buittons on the handhelp look like the Game Boy, SNES or the SNES controllers? What size screen will it have and is it scratch resistant. We will have these questions answered and will post them as soon as we find out.