NOVELTY - A rigid insert portion (50) formed of ethyl vinyl acetate (EVA) foam defines a compartment (46) accommodating a spiral wound battery (14). A control module (60) selectively allows the battery to power a 12V receptacle (62) mounted inside to permit the battery to power a 12V direct current (DC) appliance and to be connected to a 12-110V alternating current (AC) converter. The top cover (35), panels, and seams connecting the panels of the jumper case (12) are formed of a waterproof material. A cushion pad formed of EVA foam covers the control module when the top cover is in a closed state.    USE - For a portable battery jump start or battery jumper. The battery jumper is useful for the marine, camping, or recreational vehicle (RV) market.    ADVANTAGE - The insert portion is formed of EVA foam, providing a firm, but impact-absorbing cushion to the battery and components of the battery jumper. This EVA foam is desirably selected for excellent chemical resistance to alkali, acid, gasoline and oil, aromatic hydrocarbons, ketones, oxidation, and ozone. Use of this style foam achieves impact absorption with little to no damage to the battery jumper's components. The cushion pad is also desirably formed of EVA foam to shield both the control module and the battery from harm that might occur during impact when the case is closed. The battery jumper is made with a spiral wound battery to provide enhanced spill proof/leak proof capabilities resulting to a safer battery jumper. The 12V receptacle is connectable to a 12V-to-110V AC converter to power a 110V AC appliance useful for emergency power, portable power, and camping needs. The cushioning and waterproofing features of the case, insert portions, and pads protect the battery and associated electrical components from damage, preventing malfunction or inability of the battery jumper operation.    DESCRIPTION OF DRAWING(S) - The drawing shows an elevated perspective view of the assembly of components of the battery jumper.    Case (12)    Spiral wound battery (14)    Top cover (35)    Compartment (46)    Insert portion (50)    Control module (60)    Receptacle (62)