I second your experiences. I have several photos of the damage caused to my panel after all three mount points were ripped out by the bolts. Your panel looks neat compared to the mess caused in mine. Problem is using the technology to get the photos on here!!
I believe Siukalo was right in the description of the problem in that one part of the battery base only sits on the raised platform of the panel.
After a visit to the panel beater and some metal reinforcement behind the panel, coupled with 12 mm bolts and a heavier duty tray, its all back in action.
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