Really, really serious.
I can't stress this enough.
I've seen this several times.
It disappoints me every single time.
Pay attention, you will save eighty bucks.
If you own a laser printer, do not plug it into a battery backup.
If you have a battery backup where some of the outlets are labeled "Surge Only", then that's OK.
Just make sure you don't plug it in the battery side. It will cause premature battery failure, and no one wants that.
(Getting off of my soapbox now...)