That's interesting as everything I read says you should avoid cycling Lead Acid batteries at all costs as every time you do it reduces the health.
Yes, I've seen quite a few different schools of thought on the subject.
My understanding regarding normal lead acid batteries is that deep discharge and prolonged maintenance in a fully discharged state can certainly be harmful and life shortening, I try to avoid either.
On my fairly low spec Oxxtron (Trust) 1000VA UPS I have had to replace the 9 Ah lead acid battery twice to date obtaining just over 2 years life on each, on last replacement a few months ago I took the time to closely monitor the units charge regime over quite a few days as I believed the battery was being over charged and this was possibly contributing to a shorter battery life.
To assist monitoring, I used a 12V bluetooth monitor/recorder module with mobile phone app, directly connected to the battery, found that the charging cycle was tapering off perfectly to practically zero when fully charged so certainly not being over charged.
The failure of the two previous batteries only came to light when power was removed and the UPS output collapsed within a minute or so, attempts to rejuvinate the batteries with a smart charger failed on both occasions, batteries had to be replaced.
So with the current battery and BT monitor in place I intend to periodically discharge/test battery life while being careful not to deep discharge, time will tell if this will produce a longer battery life but should certainly highlight any impending battery failure.