I've recently installed a trunk battery tray designed to fit the Optima battery base. Now I'm hearing horrible quality rumors. One vendor just told me they're "all" coming back under warranty; one was just returned after two weeks. Red top and yellow tops are the same. Something to do with moving their manufacturing to Mexico and never recovering from a quality perspective. Has anyone experience a problem with Optima batteries? I'm not aware of another battery with a similar footprint.