Battery HOLDDOWN: Description
WARNING: This page is about a different car, the 2004 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The battery hold down hardware consists of (Fig 1 ) a molded plastic lip that is integral to the outboard edge of the battery tray and support unit, a molded plastic hold down bracket, a single hex screw with a coned washer and a U-nut.
When installing a battery into the battery tray, be certain that the hold down hardware is properly installed and that the fasteners are tightened to the proper specifications. Improper hold down fastener tightness, whether too loose or too tight, can result in damage to the battery, the vehicle or both.