Points common to both Acid & Alkaline Battery
❖Due to chemical breakdown of H2O, contained in the electrolyte, O2 & H2 Gases are evolved
❖Evolved gases carry mist of corrosive acid / alkaline electrolyte
❖H2 gas is highly explosive
❖Vents are provided to allow evolved gases to escape and to prevent internal pressure built up
❖Evolution of gas and evaporation causes loss of water
❖Topped up with distilled water
❖Recharged using suitable charging equipment
❖Capacity is rated in terms of its discharge current at the 10 hours rate
❖250 Ahr battery can supply 12 A for 10 hrs
❖Used for emergency power loads – emergency lighting, starting emergency generator, navigational lights, fire detection and alarm system, engine room control console and alarm circuits