a new cmos battery for          HP COMPAQ   NC2400 SERIES       CMOS BATTERY : COMPAQ P/N 412784-001 Precise fitting with long wires & precise connector plug   a new cmos bios battery for your   HP COMPAQ NC2400 SERIES NOTEBOOKS     ---including these models below---*         HP COMPAQ  NC2400 (intel based) HP COMPAQ NC2400 (celeron based) HP COMPAQ NC2400 (AMD based) ALSO AWARE THAT THIS CMOS RTC BATTERY WILL WORK ON SOME OTHER HP COMPAQ NOTEBOOKS. PLEASE VIEW THE PHOTO, WHICH REPRESENTS THE ITEM BEING FOR SALE.   this is the rtc clock battery that maintains your bios settings active, replacing COMPAQ P/N 412784-001   This battery assembly referred to as the Real Time clock battery or backup battery resides inside the Notebook to maintain the clock/date settings as well as the system confirguration for smoothe constant boot free of error codes. Now that I mentioned Error codes, that might be the reason your looking at my auction and making sure that this battery I am selling you is New, which it is! I sell only brand new batteries, not recycled batteries, so bid or buy with confidence. It's affordable and I will dispatch this to you fast. Now let me mention that this cmos battery (rtc) or backup battery will last approx 2 years of dependable usage.