Computer Batteries It is true, all computers have small internal batteries. These batteries are very much like a watch battery and can be purchased at your local electronics store. Desktop & laptop computers both have a little thing called a BIOS (or also known as Basic Instruction Operating System). This is where your computer understands it has a hard drive,cdrom, floppy, and all other electronic parts. It reports to this information to your operating system (Microsoft Windows, Linux, etc.)  From time to time these little guy loose their charge and cause havoc on your computer's functionality. The system time will not keep, your operating system may not start up are just a couple of items. In laptops, often the large system battery will not charge properly. These little batteries are not difficult to replace and are often inexpensive to replace. I you are a daring person to fix this on your own, there are a couple of things to remember: first turn off the computer and unplug it for at least 15 minutes, second after opening the case, locate the batter. If the computer is within the last five to eight years it will most likely have a socket it is sitting in. Often it can be popped out with a small flat head screw driver. Do not forget to ground yourself by resting your arm or holding a metal part of the case before you touch any internal components. When you replace the battery, you will need to re-setup the BIOS settings. Most computers ask you at the beginning of booting up to press Del (delete) or F2, etc to enter setup. There are many settings in the BIOS that is user friendly, but there are also advanced settings that may confuse the user. Consult your user manual or call us for assistance.