Thanks for everyone for their help!
My main concern was if the UPS's would work fine with wet cell batteries 
and according to you guys, it will. So I am mostly happy.  The concern 
about deep cycle issues is still there since the batteries will be 
discharged to about 80% of full charge atleast twice a weak. Given that 
the batteries are well taken care of otherwise, will they last two years 
with that frequency of deep discharge?

Also I was not aware of the fact that 220V can appear on the battery 
terminals.  I don't understand how that can happen.  I'd like to look at 
some basic UPS circuits that will show it.  Any pointers welcome.  I 
thought some sine/square wave is pumped into a step-up transformer with 
input and output being isolated by the transformer.  So how does high 
voltage appear at the battery terminals?

Thanks again.

-Hasan

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist