where is the CMOS batterie on toshiba sattelite A 500

If you look at the large version underside picture here http://www.your-motherboard.com/shop/toshiba-a500-motherboard/ it's the purplish circle just to the lower left of the CPU baseplate but I can't tell if it's soldered on or simply clips into place (EHOW says it's clipped)
Had to up ya there Clutch. I love EHOW - too bad I don't have my links (nor do I want to) on this PC...