I know this is an old thread, but I'm hoping to revive it for clarification and advice.
Ron seems to be saying that bubble wrap (i'm assuming the large bubble wrap like shown in the OP's photo) is better than expanding foam? Correct?
I'm not sure exactly what a 2x3 piece of wood would be. What is the third dimension (i.e., thickness)? Are we talking about a piece of something like plywood, or something thicker?
What about filling big gaps with polystyrene (styrofoam) blocks and then using bubble wrap to fill in smaller gaps?
I have two possible boxes that I am considering, but I haven't checked the size against the 03 civic IMA battery I am planning to ship. One is a 20x20x17 heavy duty cardboard box from an old (i.e., non flat screen) TV. The other is a plastic shipping container (Monoflo DC2115-17) with inside dimensions of 18.4" x 12.8" x 15.8" (link with photos: https://www.custommhs.com/index.php?...roduct_id=4387
Does either of these sound adequate, or will I need a bigger box? Any reason it couldn't be shipped upright (i.e. the same orientation it is installed in the civic)?
Thanks in advance for any shipping wisdom you can provide.