Why inverter battery back up time reduces over a period?

Question

Why inverter battery back up time reduces over a period?

Answer 1

Due to frequent charging and discharging deflaking of the plates takes place. Evaporation loss is another cause of reduction of life of the battery. No battery is perpetual.

Answer 2

as the e.m.f(electromotive force ) is is given to the battery the potential of the cell reduces resulting in th reduce of the back up of invertor

Answer 3

That batteries have a finite life is due to occurrence of the unwanted chemical changes to the active materials of which they are made. Otherwise they would last indefinitely. These changes are usually irreversible and they affect the electrical performance of the cell.

Battery life can usually only be extended by preventing or reducing the cause of the unwanted parasitic chemical effects which occur in the cells.