[Myron Piatek]

Cracks may result from being mounted by the 4 tabs onto an uneven or flexing surface. I believe it's suppose to be secured with straps. I think there was a discussion somewhere about that. I must admit that I use the tabs and haven't gotten around to adding straps. But my aluminum cell is mounted on boxed-in rails spanning the spare tire well. That creates a flat, stiffer foundation and helps isolate the cell.