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
HP Compaq Presario CQ56-110US Battery Replacement - iFixit Repair Guide
How To Replace Internal Battery Compaq Presario Laptop Computer - YouTube