Amazon.com: AC Doctor INC 5200mAh Battery for Dell Latitude E6400 E6410 E6500 E6510 Precision M2400 M4400 M4500 M6500 Laptop Battry Replacement 4M529 KY265 PT434 312-0749 : Electronics
Dell Latitude 6400 ATG Latitude E6400 Lati 8800mAh Replacement Battery: BatteryClerk.com
Additional Slice Battery 84W/HR For Latitude E6400 XFR/E6420 XFR – TechExpress
312-0917 Dell 56WHr 6-Cell Lithium-Ion Battery for Dell Latitude E6400 XFR Laptop (Refurbished)
Dell Latitude E6400 Battery Removal and Installation
Jigu New 6 Cells Laptop Battery For Dell Latitude E6400 E6400 Atg E6400 Xfr Precision M2400 Precision M4400 - Laptop Batteries - AliExpress
Amazon.com: 11.10V,7200mAh,Li-ion, Replacement Laptop Battery for Dell Latitude E6400, Latitude E6400 ATG, Latitude E6400 XFR, Precision M2400, Precision M4400, This laptop battery can replace the following part numbers of Dell: 312-0215, 312-0748,
7800mAh Battery For Dell Latitude E6400 XFR /E6400 ATG /E6410 ATG /E6500 E8400 - Walmart.com
C719R Dell 56WHr 6-Cell Lithium-Ion Battery for Dell Latitude E6400 XFR Laptop (Refurbished)