How do I remove the car battery? The owner's manual says there's a screw holding it in, but it doesn't say where it is. The battery sits on a smallish tray that's not much bigger than the battery itself, and there are two nuts at one end of the tray (not a screw, or screws) that look like they may be holding the tray in place. There is no visible sign of how the battery might be otherwise attached to the tray.

I hate to unscrew bolts when the manual says look for a screw.