Boxes that house the main components of something; battery box of a UPS system.  An uninterruptible power system must have batteries to be able to deliver power when the mains fail. This electrical power is stored by means of lead acid batteries. Each bank of batteries is housed in a cabinet; a battery cabinet. Measuring 800 x 800 x 1200 this are the typical dimensions of a UPS battery cabinet. All UPS batteries require UPS maintenance otherwise no one every looks inside a battery cabinet to check the condition of the batteries.