True, but i suppose I could swap out batteries every 3 months? Would
that work? or perhaps hook up the two batteries in parallel? (I think
the latter would require modifying the charging circuit?)

DaveC wrote:
On Tue, 25 Nov 2003 21:04:12 -0800, James Sweet wrote
(in message gvWwb.232169$275.873864@attbi_s53):


Worst case you could buy a new UPS that uses the same sort
of batteries and keep the new ones you bought as spares.


Except for the fact that lead-acid batteries don't store well without a
trickle charge on them.