balloon in a satellite

If you are talking about releasing it in space outside the satellite, then it'll grow bigger, since helium inside the balloon exerts a pressure on the balloon skin and in the vacuum of space, there no external pressure to conterbalance the helium pressure.

If the balloon can't sustain the inflation, it'll burst. And it's skin will keep moving in space with the velocity imparted by the burst.

Regards,

Team,

TopperLeaning.