That's exactly what it is supposed to do when you are checking battery level - red button lights up when you press it once (test) and the number of green bars indicates roughly how much of a charge you have.
The camera gimbal isn't going to "dance" till you first turn on the RC - Device - DJI Go App - then fire up the Phantom battery - press the "red" button once then release and press again for a couple of seconds - then you will be lit up on the battery (green bars) the Phantom led's will flash and the Gimbal and camera will do it's little "dance".
Maybe you have forgotten since its been some time since you have used it ........... LOL.