The Racer X Fabrication battery tie down for the 2012+ Chevy Sonic is specifically designed to work with the Braille B3121 light weight battery. The battery choice allows for the replacement of the OEM coolant tank that is quite large and oddly placed in the engine bay. The battery tie down holds the Braille battery in place and pushes the battery toward the cabin wall to provide space for the coolant tank that is placed directly in front of the battery. The battery tie down is CNC machined from 6061-T6 aluminum and comes standard in a black anodized finish with our logo laser etched on top.