Amazon.com: Compatible for Dell Latitude E4300 E5400 Fits for E6400 E6410 E6500 E6510 Series Replacement CMOS BIOS 3 Pin Battery : Electronics
Amazon.com: Rome Tech CMOS Battery for DELL Latitude E6400 E6410 E5400 E6510 E5410 - DELL Latitude E6500 CMOS Battery RTC GC02000KH00 Laptop BIOS CMOS Battery CR2032 with 3 Pin Wire Cable : Electronics
Amazon.com: Synergy Digital CMOS/BIOS Battery, Works with Dell Latitude E6400 CMOS/BIOS, (Li-Ion, 3V, 200 mAh) Ultra High Capacity, Compatible with Acer 23.22207.041 Battery : Electronics
New Bios Cmos Battery For Dell E6410 E6400 M2400 P49g Motherboard Battery - Laptop Repair Components - AliExpress