The H20 Designs Lightweight Adjustable Battery Box is here! Only available through Fast Elements, these battery boxes replace your old worn out or broken plastic box. Constructed of aluminum they are sure to last a lifetime. Battery boxes adjust from 6.75 inches long to 4.75 inches long, with the width adjusting from 4 to 3 inches. These are on slides so just put your battery in, slide the sides to touch and tighten down.