This is a battery tie down / secure for an automotive style battery. Using to of these on either side of the battery and a basic ratchet strap. Depending on your use, a strong bungee may work as well. These hold a large battery on a boat in rough water, so they should work fine in just about any application.

These will work with most standard size batteries. they work to hold side to side, while giving a location to secure a strap to hold in other directions. You will need to print 2 of these. One for each side.

The bolt holes are designed for #8 sheet metal screws but a nut and bolt will work fine as well.

I printed these in PLA and they were plenty strong with 20% infill. If using where they are exposed to the sun (deck of a bass boat) I would use ABS or ASA.