WHAT IS A UPS BATTERY ?
The most common type of battery used in today’s UPS's are the valve-regulated lead acid (VRLA) battery, also known as a sealed or maintenance-free battery. VRLA batteries are sealed, usually within polypropylene plastic, which offers the advantage of not containing any sloshing liquid that might leak or drip. Because water cannot be added to VRLA batteries, recombination of water is critical to their life and health. In addition, any factor that increases the rate of evaporation or water loss, such as temperature or heat from the charging current, reduces the life of the battery.
UPS batteries are categorised according to design life, and will not necessarily survive the full term unless a number of factors such as: Charging Ripple current, total amount of cycles, ambient temperature and battery storage are nurtured accordingly.