Two years ago I bought a used APC Smart-UPS 1250. I just got
around to trying to replace the batteries with 2 of the
17 AH, 6 volt SLA.

I was very surprised to find that somebody had rigged up
4 12-volt, 7 AH SLA batteries in series and parallel so
as to produce a 24 volt battery pack.

What is going on here? Can this unit be set up in some way,
with a jumper or a switch or something, to expect a 24 volt
battery pack instead of 12 volt?

This was a real G-job: they had broken some plastic supports
to get the other batteries to fit, and had packed some
foam in to space the batteries, rather oddly.

I am not interested particularly in experimenting with what
I expect is now a fully blown-out APC Smart-UPS 1250.

Any idea what the heck is going on here?

Thanks in advance!


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