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The sealed UPS batteries that you use have several strikes against them: 1.  UPS systems have an agreesive re-charge program in order to quickly recover from any momentary outage.  Often the batteries are operated at the equalize voltage, and not at the proscribed float voltage.  (Higher than optimum float voltage)  This causes a higher amount of gassing of the battery and a resultant water loss.  In order to have a satisfactory battery life this must be adjusted for a proper float voltage for the batteries.2.  Sealed batteries are unable to have their water reserves replenished easily.  It CAN be done, but you have to know what you're doing AND it's usually not cost effective from a commercial perspective.3.  If a battery is exercised often, it's happiest being exercised around the 50% level of charge.  The top 10% of charge creates by far the most wear and tear (and gassing) on a battery.4.  Virtually all of the sealed battery banks I've run into commercially I've had torn out and replaced by flooded cell units.  The ongoing replacements and questionable reliability of them has rendered them virtually worthless in my industry.  The lessons learned though in making a flooded cell battery live a very long time can be carried over.To have good reliability with sealed Pb batteries, they must be operated at the correct float voltage, and not at the equalize voltage.  In order to set this you must know if they are a lead-alcium or lead-antimony alloy.  Most likely to be lead-calcium, as this gasses less, but costs more.  Another thing it to not be so anal for having the batteries "topped off" before running them.  It takes +24 hours to fully charge a battery at the float voltage, but less than 8 to get to 90% of capacity.  If the on-board charging circuit maintains the battery at float, the battery should be happy, even if it is not kept at 100% charge.Mark in Utah, EE, PE
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