|Terminals/connector corrosion||Too much topping water added to cells.
Battery poorly sealed
Loose vent caps/ float guide
Battery cable damaged, or loose Connecting
bare wires directly to battery terminals
Loose terminal connections
Non application or renewal of petroleum jelly of rotection.
|Loss of capacity||Impurities in the electrolyte
Loose active materials
Incorrect proportions of acid and water in the
Low level of electrolyte
Effect of age
|Internal short circuit||Worn out separators
Accumulation of sediment.
|Reversal of plates||Assembling of the cell in reverse direction.
Charging a battery in wrong direction.
Lagging /defective cell in battery bank will be
reversed if not taken care in time
|Surface leakage in battery||Over filling of battery water.
Careless hydrometer use, spillage of
Careless acid filling during initial filling &
|Electrolyte problem||High sp. Gravity of electrolyte
Low sp. Gravity of electrolyte
High level of electrolyte
Low level electrolyte
To ensure that every cell in a battery bank is maintained in healthy state to give enhanced life & performance it is advisable to give ‘equalising charge’ at least once in year. Under ’constant potential’ mode during operation a passive layers from on the plates. This causes variation of sp. Gravity & voltage from cell to cell. To take care the battery bank to be put on ‘constant current’ charging at 6% of rate rated capacity upto 2/75PC, followed by an extended charge for 12 to 24 hours on ‘constant current’ charging at 3% of rated capacity. By this the cells are rejuvinated with fresh layer of active material, all the cells will show approx. Same sp. Gravity & voltage. As low current was given during 3% rated amps of the Ah capacity. This will not affect the activated portion of the plates, but will remove the patches of sulphate from the plates back to the soluction , increasing the sp. Gravity of cells. So, it is mandatory to give equalizing charge, once in a year, if not earlier.