The easiest way to test a UPS battery is to turn the power off at the wall socket and see how long it lasts before the UPS runs out of battery and the computer turns itself off. However, what you don't want to do is have the computer power off while you are in Windows that's really bad for your PC for a number of reasons. The best approach is to start the computer into the ‘BIOS’ which is the low level hardware menu that you or your IT guy may typically use when setting up the PC and configuring hardware options normally only once or twice in the lifetime of the computer. Note: don’t change anything in the BIOS!
Once you're in the BIOS the computer will stay in that mode indefinitely until you restart or turn off. In this mode you can safely test to see how long the battery will last without worrying about damaging your Windows installation by turning off the PC with all those back-end Windows files still open.
To access the BIOS mode start up the Windows PC and press the special BIOS entry key before Windows gets a chance to start up, typically you're not going to know what that special key is as they are different for every computer motherboard manufacturer but it's easy enough to try some of the more common options. Common keys are ESC DEL F10 F12.
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Treat this information as informative only and do not take actions or make decisions on the basis of the information contained here. All IT decisions and actions should be made after consultation with your chosen IT professional taking into account all the of the relevant factors.
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