Abstract: A battery system for an electric motor-powered marine vessel toilet is disclosed. The battery system comprises a mounting cradle and a battery having power contacts, the battery being detachably mounted to the mounting cradle. The mounting cradle includes cradle contacts for mating with the contacts of the battery, output contacts for providing power to the motor of the marine vessel toilet, auxiliary contacts for receiving power from an auxiliary power source; and a switch for connecting the output contact to one of the cradle contacts and the auxiliary contacts for supplying power to the motor via the output contacts.

Abstract: A fluid circulation system is disclosed, comprising a bidirectional motor, a first housing having a fluid inlet and a fluid outlet, a second housing having a fluid inlet and a fluid outlet, a fluid holding device coupled between the fluid outlet of the first housing and the fluid inlet of the second housing, a drive shaft operatively coupled to the motor to be driven by the motor, the drive shaft extending from the motor into the first and second housings and a first fluid transfer device mounted on the drive shaft within the first housing. The first fluid transfer device is operative to transfer fluid from the fluid inlet of the first housing, through the fluid outlet of the first housing and into the fluid holding device when the motor drives the drive shaft in a first direction.