New
#91
.UPS is not intended for long duration use, only to provide sufficient backup power for completion of a document then an orderly shutdown of the computer, probably not much more than 15 to 20 minutes, certainly not hours
As stated in Post #2 a UPS is designed to keep the computer powered on after a power outage for about 10-15 minutes, so you can save your work and safely shut down your computer the normal way. It is not designed to power your computer for hours on end.