Go to your local retailer any buy a battery of the same model or something equivalent. However, with modern computers the CMOS battery plays a lesser role as most BIOS firmware is smart enough to. Originally, the CMOS battery held a similar function, maintaining the memory that held the BIOS settings and keeping the Real-Time Clock running. Remove the battery, but avoid forcing it and any contact with other parts of your motherboard (refer to the manual provide with your motherboard). When you unplug the battery, your radio looses all of its presets and the clock resets. The positive pole of the battery should be visible. Remove the power cable attached to your system unit and remove the casing.ĭischarge your system unit from static electricity by touching it with a metallic object.įirst of all, be sure that your System unit is laid down horizontally. This type of battery is easily found and fairly cheap to purchase The most common symptom of CMOS battery failure is incorrect or slow system date and time in the BIOS, loss of BIOS settings when the computer is powered off, time-of-day clock stopped error message and so on. CMOS battery life varies based on the usage and environment of the computer (usually around 2-3 years). The most widely used battery model is the CR2032: The CMOS battery is inside the computer and attached to the system board (motherboard). On older PCs it may have a cylindrical shape. It can sometimes be hidden by extension cards or connectors. The CMOS battery is thin round button-like object. Once completed this document will be useful to check out if all the parameters are correctly inserted after replacing the battery. It’s important that you don’t make any modifications. Open the BIOS screen and note all the information on a piece of paper. It is recommended that you change the CMOS battery every 5 years. These problems may be due to the fact that your CMOS battery is depleted and it’s time to replace it. If your computer is experiencing problems with the date and time or you see the following error messages:Ĭlock not keeping its time on a restart or power cutīios cmos battery low cmos wrong memory size Saving the BIOS data prior to the battery change and configuration of the same, after the installation of the new CMOS battery, must also be done properly. The replacement process has to be carefully followed to avoid any inadvertent problems. The depletion of this battery happens and hence it must be replaced ideally every five years. The memory battery (aka motherboard, CMOS, real-time clock (RTC), clock battery) 1 6 is generally a CR2032 lithium coin cell. All these are indications that it is time to change the battery of the motherboard i.e. ![]() ![]() If drops below around 2.7-8x volts, then its dying. To avoid damage to the battery connector, firmly support the connector while removing the battery.įor information on how to remove and then replace the CMOS (coin-cell) battery in your Dell notebook, please refer to the PDF version of the Owner's Manual or Service Manual for your computer, and then search for CMOS battery or coin-cell battery, and follow the instructions.Lennox IT: IT Support in Business IT in Derby and Derbyshire: Helpful Advice on how to change a BIOS / CMOS BatteryĪ computer may sometimes not keep the correct time or show error messages related to time and date options or other errors like ‘no operating system or new CPU is installed’. If a motherboard has a serious boot issue, then first thing to check is CMOS Battery Voltage. Otherwise, the system board might be damaged by prying off the socket or by breaking circuit traces on the system board. Ensure that the object is inserted between the battery and the socket before attempting to pry out the battery. While prying the battery out of its socket with a blunt object, be careful not to touch the system board with the object. Properly dispose of used batteries as required by the local authorities. Replace the battery only with the same or equivalent type, and make note of the orientation of the battery in its socket before you remove it. Before performing any of the procedures in this section, read and follow the safety instructions in Dell Knowledge Base Article - Precautionary Measures for Personal SafetyĪ new battery can explode if it is incorrectly installed.
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