NEC Ultralite Versa S Battery for CMOS Computer Clock Memory Backup Replacement battery for: NEC Ultralite Versa S, Versa 2000, 2000C, 2000D, 2050C, 2205C, 2250 Series laptop and notebook computers
840 4.5V Alkaline Computer Battery Pack
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How is the CMOS battery related to the date on your PC? - Quora
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Rayovac 840 Computer Clock Battery : r/vintagecomputing
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Replacing CMOS Batteries in Old PC's – PC Restorer
DS3231 Real Time Clock Module RTC DS3231 3.3V/5V with Battery for Raspberry Pi for arduino DIY Kit - AliExpress
How is the CMOS battery related to the date on your PC? - Quora
How the clock of a computer shows the correct time even if we shut down the computer i.e does it remain on? - Quora
clock - Why do PCs still require a CMOS battery? - Super User
How to Replace the CMOS Battery
