Battery tray gone

[yuri]

After let´s say... around 12 packs using it, yesterday I removed the battery without noticing anything, later I removed the body to show the insides of the car and then I noticed this

It only took a small effort with my finger to give it away. I guess this is not usual, isn´t it? Guess it´s just bad luck, cos there wasn´t any specially hard crash, or maybe the battery is too big for this thin wall (rhino 3700 6s1p).