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Some computer designs have used non-button cell batteries, such as the cylindrical "[[List of battery sizes#1.2F2AA|1/2 AA]]" used in the [[Power Mac G4]] as well as some older [[IBM PC compatible]]s, or a 3-cell [[Nickel–cadmium battery|nickel–cadmium]] (Ni–Cd) CMOS battery that looks like a "[[barrel]]" (common in [[Amiga]] and older IBM PC compatibles), which serves the same purpose. These motherboards often have a four pin straight header, with pin 2 missing, for connecting to an external 3.6v battery, such as the Tadiran TL-5242/W, when their soldered-on batteries run out. Ni–Cd batteries have a tendency to [[Battery leakage|leak devastatingly]] after a period of disuse, damaging components and traces on the circuit board near the battery.<ref>{{cite web | last=Williams | first=Al | date=July 8, 2018 | url=https://hackaday.com/2018/07/08/amiga-2000-emergency-repair/ | title=Amiga 2000 Emergency Repair | work=Hackaday | archiveurl=https://web.archive.org/web/20180708201017/https://hackaday.com/2018/07/08/amiga-2000-emergency-repair/ | archivedate=July 8, 2018}}</ref>
Ever wondered why your computer retains some settings even when it’s powered off? Why the clock doesn’t reset to a default value? The answer lies in a tiny battery on your motherboard called the CMOS battery.[https://motherboardville.com/how-long-does-the-motherboard-cmos-battery-last/ Read more here]
==See also==
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