At first when I saw it dangling from the robot before it fell off I mistook it for the Radio. But then I was thinking wait a minute, the radio isn't usually blue.
Only when Art showed me the battery right after the match was I both amused, and shocked to see what happened to it.
Use stronger Velcro next time; right Art?
As a side note, these batteries are much heavier (maybe 2 times the weight) than the normal backup batteries hence it falling off under the weakened Velcro it was attached with..