The explosion risk in battery compartments is lessened by (1) ensuring good ventilation so that the hydrogen cannot accumulate, and (2) by taking precautions to ensure that there is source of ignition.
ventilation outlets are arranged at the top of any battery compartment where the lighter-than-air hydrogen tends to accumulate vent is other than direct to the outside an exhaust fan is required, and in any case would be used fore large installation The fan is in the air stream from the compartment and the blades must be a material which will not cause sparks from contact or electrostatic discharge. The motor must be outside of the ventilation passage with sea is to prevent entry of gas to its casting. The exhaust fan must be independent of other ventilation systems. All outlet vent ducts are of corrosion-resistant material or protected by suitable paint
Ventilation inlets should be below battery level with these and all openings, consideration should be given to weatherproofing.
The use of naked lights, and smoking, are prohibited in battery rooms and notices are required to this effect The notices should ed up by verbal warnings because the presence of dangerous gas is not obvious. Gas risk is highest during charging ventilation is reduced
Working on batteries there is always the risk of shorting ions and causing an arc by accidentally dropping metal tools across terminals. (Metals jugs are not used as distilled water containers for this reason.) Cables must be of adequate size and connections well made.
Emergency switchboards are not placed in the battery space because of the risk of arcing the precaution is extended to include any non-safe electrical equipment, battery testers, switches, fuses and cables other than those for the battery connections. Externally fitted lights and cables are recommended, with illumination of the space through glass ports in the sides or deck head. Alternately flameproof light fittings are permitted.
Ideal temperature conditions are in the range from 1 5°C to 25°C . Battery life is shortened by temperature rises above 50°C, and capacity is reduced by low temperaturesProfessional Car Battery Installation Tool - Terminal Spreader & Cleaner
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