Is your Dell Latitude laptop forgetting the time or BIOS settings every time you unplug it? Chances are, the CMOS battery needs replacing. This is a brand new replacement CMOS battery compatible with a ton of Dell Latitude E-series models like the E5470, E5480, E5490, and E5500 through E5550. From GF Computers, it's the little coin-cell battery that keeps your system clock and configuration running when the laptop is off. Super easy to swap out if you're comfortable opening up your laptop (plenty of guides online). Comes new in packaging. If you're getting CMOS errors or constant date resets, this inexpensive fix will save you a headache. Keep your Dell running smoothly!