Amazon.com: Synergy Digital CMOS/BIOS Battery, Works with Dell Latitude E6410 CMOS/BIOS, (Li-Ion, 3V, 200 mAh) Ultra High Capacity, Compatible with Acer 23.22207.041 Battery : Electronics
2 pcs CMOS Battery GC02000KH00 BIOS for Dell Latitude E6400 E6410 E6500 E6510 | eBay