my 2nd mod ever and i need a little help

[evilgenius101]

ok I’ve been reading this forum for a year and i finally have some thing to say/ask... yay

I’m trying to put a yobo console and a donkey kong cart into a nes advantage controller, so all you got to do is plug it in to the TV and play.

my problem is I want it to run off a rechargeable 9volt battery I was hoping there is a way i could charge the battery and play the game at the same time I know there are circuit boards that do this but I don’t know if there are any for 9volt's or what they are called

Thanks