The Dell Latitude E5540/E5440 6-Cell Laptop Battery is a high-quality lithium-ion battery designed to deliver reliable and long-lasting power for Dell Latitude laptops. With a 65Wh capacity and 11.1V output, this 6-cell battery ensures up to 7 hours of productivity, depending on usage. It features advanced protection against overcharging, over-discharging, and short circuits, ensuring safety and durability. Certified to meet industry standards (UL, CE, FCC, and RoHS), this lightweight and portable battery is an ideal replacement to keep your Dell Latitude E5540 or E5440 running efficiently for work or travel.