[MrForbes]

it would be nice if the battery cables are not anywhere near metal parts, if you can make that happen. Lexan (polycarbonate sheet) is a great material for building battery mounting stuff, and a wide nylon strap with a plastic buckle is a nice easy quick way to secure the battery into a box, as long as the box holds the battery securely so it cannot move sideways. If you do run the battery cables along a metal surface, it would be nice to secure them to it with some type of cable clamp.

(in this picture the battery box is made of Lexan, which is painted black, normally it's clear)