– The Dell Latitude Series is a durable and portable line of laptops designed for business professionals. – The CMOS RTC BIOS Battery is a small, coin-shaped battery that provides power to the computer's real-time clock and BIOS settings. – Without a working CMOS battery, the computer's clock will not keep accurate time and the BIOS settings may be lost. – The 10x CMOS RTC BIOS Battery for Dell Latitude D610 D620 D630 D820 D830 M90 0G4221 is a high-quality replacement battery that is designed to meet or exceed the specifications of the original battery. – It is made with durable materials and is backed by a 1-year warranty. – Additional features: – Easy to install – Long-lasting battery life