How to increase the operating life of a battery to meet the required warranty period is a question which many SMEs face. Obviously we need to know the common modes of failure of battery and control them. Although a battery may fail due to many reasons, we shall now consider only the most common modes of failure of batteries.The common failure modes well –known for decades are:-

1. Corrosion of grids and connectors
2. Shedding of paste from plates
3. SULPHATION of plates – particularly on negatives 

We need to control all of above to extend life of battery