Title says it all. Does a battery falling out count as an early expansion?
I had a match at the Las Vegas Sig event where my battery cable got unplugged somehow (this is a mystery to this day) and my cable was outside of the 18 x 18 x 18 cube before endgame. This was ruled as early expansion, and seems to me like a fair ruling, as the battery cable is part of my robot. A battery falling out would deemed as early expansion also seems fair, as it is outside the required size of your robot.
If the battery is still connected to your robot (through a cable) it is early expansion.
If the battery completely falls off and disconnects from the wire, it’s a warning for detaching parts.
Yes. Game manual makes no distinctions as to what part of your robot exceeds size, nor the circumstances of deliberate or accidentally.