This Charging assembly replaces older charging assembly. The charger is a fully automatic multistage unit for charging the internal battery of your jump starter. The circuitry allows for either AGM or standard (flooded) batteries. This upgrade kit replaces all internal components on the charging board including the transformer, board and circuit breaker. Includes charger, mounting spacers and hardware, wires and instructions for a complete install. Includes (1) 218-060-666 Single Battery unit & (1) 865-946-666 Dual Battery unit.