A marine battery charger cable extender comprising: - a terminal end including a positive extender ring terminal configured to connect to a positive battery terminal and a negative extender ring terminal configured to connect to a negative battery terminal; - a connection end configured to connect to a terminal end of a pre-wired battery charger, the connection end including: a positive ring end; a positive ring connector configured to hold the positive ring end in galvanic connection with a positive ring terminal of the pre-wired battery charger; 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; 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; wherein each of the positive connection cover and the negative connection cover are formed by a first cover piece and a second cover piece that are releasably connected together; and characterised in that each first cover piece and each second cover piece have an opening configured to allow the respective ring (14, 26, 16, 27) to slide through a first end portion of the first cover piece and a second end portion of the second cover piece. - a terminal end including a positive extender ring terminal configured to connect to a positive battery terminal and a negative extender ring terminal configured to connect to a negative battery terminal; - a connection end configured to connect to a terminal end of a pre-wired battery charger, the connection end including: a positive ring end; a positive ring connector configured to hold the positive ring end in galvanic connection with a positive ring terminal of the pre-wired battery charger; 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; 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; a positive ring end; a positive ring connector configured to hold the positive ring end in galvanic connection with a positive ring terminal of the pre-wired battery charger; 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; 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; wherein each of the positive connection cover and the negative connection cover are formed by a first cover piece and a second cover piece that are releasably connected together; and characterised in that each first cover piece and each second cover piece have an opening configured to allow the respective ring (14, 26, 16, 27) to slide through a first end portion of the first cover piece and a second end portion of the second cover piece.