Where should storage batteries be located?

Storage batteries shall be located within a protective enclosure or area accessible only to qualified persons. A protective enclosure can be a battery room, control building, or a case, cage, or fence that will protect the contained equipment an limit the likelihood of inadvertent contact with energized parts.

Do I need a separate room for the battery-pack?

If you do not need to use a separate room for the battery-pack, consider placing them in a room where the H2 concentration can never reach dangerous levels (circulated air, consult your ventilation and fire safety engineers). My advice is free of charge and of respective quality.

Do flooded batteries need a separate enclosure?

Normally we follow National Electric Safety Code (NESC).Section 18 of this code specifies that the batteries (flooded) should be in a seperate enclosure and further says that this protective enclosure can be a battery room with seperate continuous ventillation.

Can a battery room be non-classified?

If the room's ventialtion is sufficient to prevent a build up of hydrogen gas, then the area can be non-classified. But given the small cost of explosion proof lights, switches and receptacles, it is cheap insurance to use them in the battery room.

Should batteries be in a separate room?

Battery rooms are considered hazardous (classified). So you'll need provisions for class I div II at minimum. read over article 500-504. If it is broken, fix it. If it isn't broken, I'll soon fix that. I don't believe there is an NEC requirement that batteries be in a separate room.

How to remove hygrogen concentrations from battery room?

The battery room will become unclasified if you can remove hygrogen concentrations by providing redundant extract fans and supply fans for fresh air. Therefore, requirement for explosionproof electrical utilities such as lighting,power sockets, exhaust fans to be installed in the room can be eliminated.