The Dell Latitude E7440 and E7450 laptops share the same battery specifications. They use Lithium-ion batteries with voltages between 7.4 V and 11.4 V, depending on the cell type. The two most common capacities are the 47 Wh (4-cell) and the 54 Wh (6-cell) options.
Battery Options
4-Cell Battery (47 Wh):
Voltage: 7.4 V
Capacity: 6350 mAh
Part Numbers: 34GKR, 3RNFD
General Specs & Performance
Battery Type: Rechargeable Lithium-ion (Li-ion) or Lithium Polymer
Lifespan: About 300 to 500 charge cycles before capacity degrades
Run Time: Roughly 4 to 8 hours, depending on screen brightness and your specific apps
Charge Time: About 2 to 3 hours for a full charge when the laptop is idle