Compatibility: Specially designed to be compatible with HP 6520S and HP 540 laptop models.Battery Type: Lithium-ion battery with 6 cells, providing reliable power for daily computing needs.Capacity: 4400mAh, ensuring sufficient battery life for regular usage.Voltage: Operates at 10.8V, delivering stable and consistent power output.Battery Life: Offers a balanced battery life suitable for various tasks, including work and entertainment.Design: Compact and lightweight, with a 6-cell design that fits seamlessly into the laptop?? battery slot.Durability: Made with high-quality materials to ensure long-lasting performance and reliability.Safety Features: Includes built-in protection against overcharging, overheating, and short circuits for safe usage.Installation: Easy to install and remove, designed for a perfect fit without the need for special tools.Certification: BIS Approved