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In a desktop computer, the battery stores the CMOS settings and keeps the real-time clock running. In a laptop computer, the main battery is used to power the computer when it is not plugged into a wall adapter.
To change a desktop computer battery, first turn off the computer and unplug it from the power source. Open the computer case by removing screws or sliding off the side panel, depending on the model. Locate the CMOS battery on the motherboard, usually a round, silver coin-cell battery; carefully remove it and replace it with a new one, ensuring the correct orientation. Finally, close the case, plug the computer back in, and power it on.
In the case of a desktop computer a power supply that in turn plugs into a household outlet provides power to the internal components of the computer. In the case of a laptop or tablet a battery provides power.
In a desktop computer the battery is located on the PC motherboard. It looks like a silver button about the size of a quarter, in the center of a black circle of plastic. In a laptop the battery is quite a bit larger and is usually found on the bottom of the laptop near the back, underneath the screen hinge.
The amount of power in the battery is a function of the time Erik runs the computer on the battery.
The only battery in a desktop computer is the one used to keep the clock running when the machine is powered down, provide some juice for the BIOS to start, and keep a few neurons of CMOS memory alive so that the machine knows what to do when the power-on button is pressed. It's nothing but a small silver 'button', like a wrist-watch battery, typically on the motherboard.
That means your computer has entered a state of Hibernation to conserve battery life. Very useful if you're working on something at work or school, and you want to resume the progress at home.
If you have a laptop, it should say on the underside either on the batter cover, or on the battery itself. For a desktop computer, it might say on a sticker above the power socket. If not, you'll need to open up your computer and have a look on the PSU (Power Supply Unit). This is located adjacent to the power socket.
To power your computer without a battery
CMOS battery of your laptop maintains hard disk, time and date, and other drivers and configuration settings in a CMOS memory. You will see these tiny CMOS batteries connected directly to the laptop’s motherboard.
A laptop is designed to be portable, which is why a laptop has an internal battery. Laptops can also be powered using a cable plugged into the mains. This power cable is also used to recharge the battery. One advantage of the internal battery in a laptop is, if there is a sudden power outage, the battery will continue to power the laptop until the battery runs down. In a power outage, a desktop computer would simply stop working.
One difference between a desktop and a laptop is that a laptop is portable while a desktop is stationary. Laptops are usually smaller and can run off of battery power while a desktop is bigger and has to be plugged in to work.