The Dell Latitude E4310 E5500 E5400 E5410 E5420 3 Pin BIOS CMOS Battery is a Panasonic brand CMOS battery specifically designed for Dell laptops. This battery is compatible with various Dell models and provides a reliable power source for the laptop's CMOS, ensuring proper functionality and security. With its 3 pin design, this CMOS battery is a convenient and essential accessory for maintaining your Dell laptop's performance for an extended period of time.