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A battery box with a lid and a tray assembly for batteries for a hybrid electric vehicle. The lid and tray assembly are made of steel with an internal and external spray coating of an elastomer with high electrical resistance properties. Batteries are mounted in the tray assembly and enclosed by the

A battery box with a lid and a tray assembly for batteries for a hybrid electric vehicle. The lid and tray assembly are made of steel with an internal and external spray coating of an elastomer with high electrical resistance properties. Batteries are mounted in the tray assembly and enclosed by the lid. The elastomer coating on the tray assembly and the lid provides a non-electrically conductive interior and exterior surface for increased service safety. The steel base material of the tray assembly and the lid provides shielding from electromagnetic interference and radio frequency interference associated with the high voltages required to operate electric motors in hybrid electric vehicles. Additionally, the tray assembly has vents designed to optimize cooling of the batteries.

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[ We claim:] [1.] A battery box for a mobile vehicle with batteries of a fixed height, and a chassis with frame rails, comprising:(a) a tray assembly for holding the batteries;(b) a lid for installation onto said tray assembly to enclose the batteries and both said tray and said lid are made of stee

[ We claim:] [1.] A battery box for a mobile vehicle with batteries of a fixed height, and a chassis with frame rails, comprising:(a) a tray assembly for holding the batteries;(b) a lid for installation onto said tray assembly to enclose the batteries and both said tray and said lid are made of steel;(c) a means for attachment to a frame rail of the chassis; and(d) both said tray assembly and said lid being coated with an elastomer with high electrical resistance.