A system for enclosing an energy source for a material handling vehicle, the system comprising: an enclosure having a front wall, a rear wall, a top wall, a bottom wall, side walls (46, 50) and forming an interior compartment; an inlet channel integrally formed with the front wall and in fluid communication with the interior compartment, the inlet channel defined by an inlet louver and inlet segments (90, 92, 94) of an inlet flange, the inlet flange defined by two or more of the inlet segments (90, 92, 94); an outlet channel integrally formed with the rear wall and in fluid communication with the interior compartment, the outlet channel defined by an outlet louver and outlet segments (110, 112) of an outlet flange, the outlet flange defined by two or more of the outlet segments (110, 112); one or more energy source cells (68, 70) positioned within the interior compartment; a cooling fan in fluid communication with the inlet channel and the interior compartment; a charger positioned within the enclosure and being electrically coupled with the one or more energy source cells (68, 70); and a battery management system positioned within the enclosure and electrically coupled with the one or more energy source cells (68, 70); wherein the cooling fan operates to draw air through the inlet channel to the interior compartment such that air within the interior compartment is expelled out of the outlet channel, wherein the one or more energy source cells (68, 70) are positioned below the battery management system and the charger within the enclosure, wherein air entering the air inlet channel is directed upward along the inlet segments (90, 92, 94), is drawn through the cooling fan and is projected into the interior of the enclosure, and air directed out of the enclosure flows downward along the outlet flange, and wherein the configuration of the inlet louver and segments of the inlet flange, and the outlet louver and segments of the outlet flange prevents water from entering the interior of the battery enclosure and allows air to enter the air inlet and exit the air outlet. an enclosure having a front wall, a rear wall, a top wall, a bottom wall, side walls (46, 50) and forming an interior compartment; an inlet channel integrally formed with the front wall and in fluid communication with the interior compartment, the inlet channel defined by an inlet louver and inlet segments (90, 92, 94) of an inlet flange, the inlet flange defined by two or more of the inlet segments (90, 92, 94); an outlet channel integrally formed with the rear wall and in fluid communication with the interior compartment, the outlet channel defined by an outlet louver and outlet segments (110, 112) of an outlet flange, the outlet flange defined by two or more of the outlet segments (110, 112); one or more energy source cells (68, 70) positioned within the interior compartment; a cooling fan in fluid communication with the inlet channel and the interior compartment; a charger positioned within the enclosure and being electrically coupled with the one or more energy source cells (68, 70); and a battery management system positioned within the enclosure and electrically coupled with the one or more energy source cells (68, 70); wherein the cooling fan operates to draw air through the inlet channel to the interior compartment such that air within the interior compartment is expelled out of the outlet channel, wherein the one or more energy source cells (68, 70) are positioned below the battery management system and the charger within the enclosure, wherein air entering the air inlet channel is directed upward along the inlet segments (90, 92, 94), is drawn through the cooling fan and is projected into the interior of the enclosure, and air directed out of the enclosure flows downward along the outlet flange, and wherein the configuration of the inlet louver and segments of the inlet flange, and the outlet louver and segments of the outlet flange prevents water from entering the interior of the battery enclosure and allows air to enter the air inlet and exit the air outlet.