A marine battery charger cable extender includes a terminal end that has a positive extender ring terminal and a negative extender ring terminal, and a connection end configured to connect to a terminal end of a pre-wired battery charger. The connection end includes a positive ring end, a positive ring connector configured to hold the positive ring end and galvanic connection with a positive ring terminal of the pre-wired battery charger, and a positive connection cover configured to completely encapsulate the connected positive ring end of the cable extender and the positive ring terminal of the pre-wired battery charger. The connection end also includes a negative ring end, a negative ring connector configured to hold the negative ring end in galvanic connection with a negative ring terminal of the pre-wired battery charger, and a negative connection cover configured to completely encapsulate the connected negative ring end of the cable extender and the negative ring terminal of the pre-wired battery charger.