Dell VJXMC | 4-Cell 40WHr Battery 2690 Latitude E5440 E5540

Here are the technical specs for the Dell 4-Cell 40WHr Battery 2690 Latitude E5440 E5540:

- Battery type: Lithium-ion
- Battery capacity: 40WHr
- Number of cells: 4
- Voltage: 14.8V
- Compatibility: Dell Latitude E5440, E5540
- Battery life: Up to 4 hours

Helpful notes:
- This battery is a genuine Dell product and is designed specifically for use with the Latitude E5440 and E5540 laptops.
- It is a 4-cell battery, which means it is smaller and lighter than a 6-cell battery, but may have a shorter battery life.
- The battery capacity of 40WHr is a good balance between battery life and weight/portability.