Solved: XPS 8900, how to remove the CMOS battery? - Dell Community
Synergy Digital CMOS/BIOS Battery, Works with Dell Precision M4500 CMOS/BIOS, (Li-Ion, 3V, 200 mAh) Ultra High Capacity, Compatible with Acer 23.22207.041 Battery - Walmart.com
Dell Latitude E5570 (P48F001) CMOS Battery Removal & Installation