My opinion about UPS batteries

UPS batteries have always a lot of cells connected to series and many times parallel too. Using charging method where batteries are resting will reduce corrosion during resting period (tested by YUASA and HAWKER in 80S with VRLA AGM batteries). After resting period, it is very important to get batteries (all cells) full charged. If batteries are not equal, it can be challenging. Weak batteries become weaker time after time and will be broken faster than others. It is good to find weak ones before they are broken and using periodical charging method you will find them. OCV should not be too low during resting period. If you are using standard AGM lead-tin / lead-calcium-tin alloy products UPS system should work ok, if recharge voltage is 2.33 VPC + 20 C X hours and after this period normal float voltage X h. If you are using AGM thin plate pure lead products, all cycles can be challenging because very limited cycle capability. So, it is very important to use right type of recharging voltage and current if you are using periodical charging.

Depend on the battery technology being used. Most UPS type batteries (AGM Flat plate) are not design for deep discharge cycling. If this was a design requirement, a tubular plate Gel or flooded type battery would be selected.

UPS and Telecom batteries are continuously float charged not only to keep them fully charged but more importantly to minimize positive grid corrosion which maximizes battery life. All UPS battery life estimates (and warranties) are based on this since UPS batteries tend to ultimately fail due to positive grid corrosion / grid growth (not paste shedding or cycle-out). The positive grid actually corrode more rapidly when the battery is at open circuit than when the battery is being properly float charged. If my memory serves me, it was established sometime in the late 1980's that grid corrosion is minimized when the positive plates are polarized 30 - 70mv above the OCV.