To prevent Explosion in Battery room

1.Providing proper ventilation inside the compartment. 

• Independent exhaust fan provided [Non-sparking type; should not produce static charge]
• Inlet duct should be below battery level. Outlet duct top of the compartment.  [Both batteries emit Hydrogen. Hydrogen is lighter than air. It accumulate on top of  the compartment] 

2.By preventing any source of ignition. 

• No smoking; No naked flames.
• Battery room lighting must be flame proof (Ex d)
• Room temperature to be maintained between 15°C-25°C 
• Battery should never be placed in emergency switchboard room. [chances of sparking due to arching of circuit breakers] 
• Maintenance tools must be rubberized coating to prevent accidental short circuit. 
• No metal jugs for filling distilled water inside batteries.
• Cables should be adequate size and well connected.