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==CMOS battery==
<!-- [[Rechargeable CMOS battery]] redirects to this section; if this section is renamed, please change the incoming redirect. Thanks! -->
[[Image:Battery-lithium-cr2032.jpg|right|thumb|150px|Type CR2032 [[button cell]], the most common CMOS battery.]]
The memory battery (aka motherboard, CMOS, [[real-time clock]] (RTC), clock battery)<ref name=whatiscmos /><ref>[http://en.kioskea.net/faq/625-replacing-the-battery-of-your-motherboard-cmos-battery Ask a question » Replacing the battery of your motherboard (CMOS battery)]</ref> is generally a [[CR2032]] [[lithium battery|lithium]] [[coin cell]]. This cell battery has an estimated life of 3 years when [[Power supply unit (computer)|power supply unit (PSU)]] is unplugged or when the PSU power switch is turned off.<ref>
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