![]() It powers the internal clock and stores system settings such as date and time when the computer is turned off. What Does A CMOS Battery Do?Ī CMOS battery, also known as a Real-Time Clock (RTC) battery, is an essential component of your computer that keeps it running smoothly. Replacing them periodically will ensure you always get maximum performance out of your PC while keeping your personal information safe and secure. Without regular maintenance and care, these batteries can become worn out over time leading to loss of data or even failure of your entire system. The size and shape of these batteries vary depending upon the make and model of your hardware, however they are typically small cylindrical units that measure only a few centimetres long. It works in tandem with other components on the motherboard to provide reliable electricity for your machine when the main AC supply fails or is disconnected temporarily. This miniature powerhouse functions by providing stored energy from one cell into two terminals – referred to as the positive and negative terminals. Without this tiny but powerful device, a computer would be unable to start up correctly or function at its full potential. It provides a steady source of power for the computer’s Basic Input/Output System (BIOS) allowing it to retain important settings such as time, date, boot order and system configuration. The CMOS battery is an integral component of many computers and electronic devices. So if you want to gain mastery over one of the most essential components of computing, read on and find out everything you need to know about CMOS batteries! What is a CMOS Battery? We will also discuss how this simple maintenance task can help keep your system running at peak efficiency. But don’t despair! In this article, we’ll provide all the details needed to understand when a CMOS battery needs replacing. Many computer owners have the same question and struggle to find an answer. Like someone said, they're cheap, easily available (mine were lying around because I have a scale that uses them) and fairly easy to replace in most desktop comps.Are you asking yourself “how often should I replace my CMOS battery?” Don’t worry, you’re not alone. power cord connected) - try chaning the CMOS battery. TL DR If your comp does absolutely nothing at all and you've exhausted the obvious silly reasons (ie. The issue came up after I came back from a trip - maybe the nine days of being disconnected from mains managed to kill the batt for good? Being connected to power overnight, or changing the PSU, didn't help (both PSU's did pass the pin test so they weren't the likely culprit anyway).Īt least I finally got around to cleaning the computer, though. Mine never gave any of the usual signs (dates going wonky etc.). So yeah, some MoBo's apparently refuse to do anything at all if the battery is dead. The motherboard in question: Gigabyte H87M-D3H Computer would not power up at all, no fans spinning, no nothing - graphics card's and USB disk's status LEDs did light up, so clearly there was power somewhere to be had. I just managed to solve my issue by simply replacing the CMOS battery. A dead or weak CMOS battery will not prevent the computer from booting. You will not find this advice on the web that the CMOS battery could be the culprit because as they explain, "The purpose of the CMOS battery is to only hold date and time. No costly unnecessry PSU, CPU, RAM, MOBO replacement.Īnyone has any theories as to why a weak CMOS battery would prevent the computer from booting and shutting down mid way before a complete boot? It's ridiculous. The computer then worked like a champ again and has no problem booting. None worked so he decided to change CMOS battery. ![]() re-seat hardware, install another PSU, etc. You need to test your computer with another PSU."Īnother person with similar computer issues like me jumped through loops with the advice they gave him online, e.g. I looked online and the comments were mostly, "The culprit is most likely the PSU. The computer would power up after pressing the power button but then it would immediately shut down after two seconds. Then just last week my computer acted even more strange than what I've described above. What confused me was the computer worked like a champ when the computer decided to power on. At first it was a few minutes, then it gradually took a whole day for the computer to drain, then only would the computer boot up. I would have to drain the computer by disconnecting the PSU. And even if I did properly shut down the computer the night before, it still wouldn't turn on the next morning. It wouldn't turn on after a power outage. For the last two years I couldn't figure out why my three year old computer wouldn't boot. ![]()
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