Tedster said:So far, the research indicates that lead-acid should not be deeply discharged and should also have a charge on it as often as possible.
This is essentially correct. There is no maintenance as such for UPS batteries. The manufacturers have designed the charging circuits to maintain the best operating conditions possible. The most important thing for UPS battery life (besides avoiding deep discharge) is to keep them from getting too warm. High ambient temperatures have a detrimental effect on their service life. Usually the manual that came with the UPS has sufficient info on their care.