i just changed my roboquad's batteries yesterday, and you should see him go! When I first got him, he was never this hyper! Even with my whole family crowded around him, he wasn't like this! Those old batteries must have been old when i put them in for the first time. I'd make an animation of how fast my roboquad was going, but now he's gotten a little more slow sence  I kinda wore him out from autonomous mode. But i was surprised of how slow he went when his batteries were dead, then when i put them in!