An equipment cabinet mounted on a concrete pad. The cabinet includes an
upper equipment chamber, a lower back-up battery chamber and a heat
exchanger. Ambient air is drawn across batteries in the lower chamber
before being drawn into the heat exchanger to help cool electronic
components in the upper chamber. Air in the upper chamber is separate
circulated through the heat exchanger. A cold plate is placed beneath the
batteries and is connected to a refrigeration system. A heating pad is
located below the cold plate and is separated from the concrete pad by
insulation. The cold plate and the heating pad are used to maintain the
batteries at about 25.degree. C. regardless of ambient temperatures so as
to extend the useful lives of the batteries.
