Synergy Digital CMOS/BIOS Battery, Works with HP Presario CQ56-122NR CMOS/BIOS, (Li-Ion, 3V, 200 mAh) Ultra High Capacity, Compatible with Advent GC02000KJ00 Battery - Walmart.com
CMOS Battery for Compaq Presario V6000-V6400 Series PC Laptop Power Clock Bios | eBay