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A UPS inside a battery that "kicks in" when the device on a loss of power from the primary source. If you are using the computer when the UPS notifies you of the power off, you have time to save any data you are working on and exit gracefully before the battery runs out. When all power runs out, any data in your computer's random access memory is erased.
If you go to any shop to Repair Your Laptop then he will never be Repair Your UPS in your front of you and give you little time, and he will change your Battery parts and he will do fraud Activity with your system, your system will be work well and good for few days but after it will create randomly problem due to computer parts, so please don't try do this all and Repair Your Laptop At Your Eye Sight.