If you are running an older system that relies on the CMOS battery to keep the BIOS settings configured properly, a CMOS battery is necessary for that computer. In these cases, keep in mind that you might still lose the clock and need to reset some things if your device ever loses power completely and has no battery going to keep those settings current. If you were running a computer for a long time without a CMOS battery but made no changes or tweaks to the BIOS, you might be okay with just putting in a CMOS battery or running it without one. Having said all that, if there are no other problems present, t he BIOS should default to stock settings if you were to put a CMOS battery back in the system. Now, imagine having to go through this process every time. If you aren’t particularly tech-savvy, you could configure the BIOS incorrectly and cause certain malfunctions within the system. For most people, this can be a painstaking process that requires a lot of precision to get right. If you’ve done this several times and are confident, it may not take very long to do. Think about having to tell your computer how to function and how to access or run its own hardware every time you start it up. There’s not necessarily a comprehensive list of all makes and models of personal computers that are capable of booting without a CMOS battery present.Įven if you’re dealing with a system that decides that it will boot without a CMOS battery present, there are still BIOS configurations to consider. Some desktops you use throughout your life may decide that it is okay to boot even without detecting a CMOS battery. Further, as mentioned, it is less common to find standard CMOS batteries in modern laptop systems. If so, there might be less to do or reset if you don’t have a CMOS battery. The CMOS may be a backup to keep the clock going in this case. In dire cases, the machine may not boot up at all, and you would be left to figure out how to fix this.Īssuming you’re on a newer system that doesn’t necessarily store the settings, we’re talking about only a volatile CMOS battery, there could be less of an issue running such a device. This can be a time-consuming process, and any wrong settings to the BIOS itself could cause instability in the system. Should you fail to replace the battery, you would need to restore the clock and set up the BIOS again each time you booted up the computer. If you are dealing with such a system, both the clock and the BIOS will lose settings. For older systems that rely on the CMOS battery rather than flash RAM memory storage for such settings, it can be more of an issue to lose any power to the battery. This can depend on how old a system you are running. What Happens if You Don’t Have a CMOS Battery? This can also help you replace a laptop battery without losing settings while the device has no power. The RTC battery is the thing that keeps track of your computer’s real-time clock, even when it is unplugged from the power source. This newer method of storage achieves the same effect but eliminates the technical need for the more traditional CMOS battery that might have been on the motherboard. Not all laptops have a CMOS battery because instead, they use a soldered RTC battery to achieve many of the same effects.ĬMOS settings are still present and necessary within these systems, but they are usually stored in flash RAM memory instead. If your laptop is brand-new or only a few years old, it is less likely that it has a traditional CMOS battery. This will allow you to check for CMOS batteries without opening the casing. One of the easiest ways to check and see if a CMOS battery is present is to see if your laptop manufacturer put one in your model. It is possible that your laptop doesn’t have such a battery, and you may be wondering how it can function at all without one. Why Doesn’t My Laptop Have a CMOS Battery? Additionally, BIOS tells a computer’s hardware how to function, and this includes vital components like the hard drive.Īs you might imagine, proper BIOS settings are necessary for a computer’s standard operations, including starting it up at all. These settings tell a computer how to boot up and help it maintain control of and access to things like your keyboard. A BIOS on a computer is, in part, a lot of the information you will see if you watch the computer screen when everything first starts up. However, it is also true that some laptops will have a CMOS battery installed.Ī CMOS battery is vital in helping a computer maintain its BIOS settings. It is crucial in both systems, but manufacturers and developers have found a different way to address BIOS concerns and settings regarding portable computers. A CMOS battery will be present in standard desktops.
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