The CMOS battery has nothing to do with the system reboot. how "new" is this mobo? That battery should last for 3 to 5 years. I'm thinking you have other issues with you system. Please list the specs for your puter for review. Thanks!
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EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.