I was talking about this sort of thing:
http://www.jkovach.net/projects/powerquality/

The writer says that the Smart-UPS's have better output (close to a
true sine wave)  than the Back-UPS's (modified square wave).

Since the power here has been pretty reliable, and the battery power
is only used for a few minutes in an emergency, this probably isn't an
issue for most people.
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