I don't know sorry. I've only ever used it for the DS Lite related features. If anyone else knows I am also very curious because I am the type of person that only plays 1 game at a time generally. Next time I get around to playing some GBA games not on gameboyinterface I'll test it for you if nobody responds within that time, but I don't know how long that will be.Does the Mode B Link setting have better battery life compared to Mode A?