the battery back up run about half hour but i guess it's depend on your loading.
after doing a simulated power failure it shut down my open programs on time (configurable) and then shut the pc softly.
i am glad i got this 2200va ups, it save the life of my home pc 2 days ago.
first its making use of a too long unused port thats just wasting away on todays pc's, and second for a device thats never unplugged why waste a usb port?
goes perfect with my game pc.
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