APC SmartUPS 1400


May 6, 2009
I have had the UPS dismounted, because the battery was cracked and seemed to require replacement.

The technician who dismounted is likely to have forgotten whether the fuse should be screwed to the (+) or the (-) ends of the new batteries, and, there seems to be no clear indication within the manual at http://www.apcmedia.com/salestools/ASTE-6Z8L9X_R0_EN.pdf.

I don't have that specific model, but on all of mine, the fuse is connected from the (+) terminal of one battery to the (-) terminal of the other battery. The batteries are installed in series, i.e., 2 x 12V = 24V.