Mitsubishi Electric BC39 Installation, Operation & Maintenance Manual page 13

Operating Temperature: 20°C to 25°C (68°F to 77°F) recommended for optimum battery
performance.
Ventilation: Through ventilation slots front and rear. A minimum of four inches is required in
front and behind the cabinet. This refers to obstruction of ventilation only. Clearance around the
equipment should be as suggested by NEC and/or all applicable national and local codes.
Under certain conditions, batteries can vent potentially explosive gas (hydrogen).
Never enclose batteries or battery cabinets in a sealed room.
Batteries should be stored no longer than three months at 25°C (77°F) or lower
before recharging. Exceeding the recommended ambient storage temperature may
cause damage to the batteries.
8/27/2013 13
BC39 B C
ATTERY ABINET
755-00039 R02