The battery holder is pretty sturdy. Unless of course you get a freak accident where the car gets hit exactly below the chassis where the battery placement is.

Anyway my guess is that if that gets hit very hard below the chassis, the tank will go first. Be careful though that as the receiver pack is made up of 5 x AAA batteries connected together in series, the connections can break on a sudden impact. You may get a runway ! The only thing that would save you in that event is a TRS (Throttle Return Spring).