This shelf is strong enough, and the perfect size, to mount a lithium battery in a Camco box, for an outdoor, off-the-grid solar application. We actually mounted the shelf upside-down, and spray painted it (and the Camco box) with Rustoleum paint, to protect it and make it look nice in our application. Upside-down, the shelf has edges that help hold the battery securely, and there were sufficient screw holes to allow us to attach the shelf tightly to our beam. We drilled one drain hole in the shSee full review