preferred embodiment both the battery unit housing and the cochlear stimulator housing are made of plastic battery unit 20 comprises an internal battery not shown housed in a battery case the battery unit 20 connects with the cochlear stimulator 10 via the insertion of the male insert 30 into the female acceptor 40 the latter of which is constructed integral with the battery unit 20 housed within the female acceptor 40 are two terminal posts 45 a 45 b that are inserted into the two terminal sockets 35 a 35 b respectively as such the insertion of the male insert 30 into the female acceptor 40 provides mechanical stability for the assembled cochlear stimulator 10 and battery unit 20 while the insertion of the terminal posts 45 a 45 b into the terminal sockets 35 a 35 b provides the electrical connection that powers the cochlear stimulator 10 note that although the preferred embodiment has terminal posts in the acceptor and terminal sockets in the male insert in an alternative embodiment not shown the terminal posts may be on the male insert and the terminal sockets in the female acceptor likewise although the acceptor is illustrated as being on the battery unit and the male insert is illustrated as being on the cochlear stimulator these features may also be reversed one or more o rings may be used to provide added protection when more than one o ring is used they are preferably slightly spaced apart from each other furthermore the o ring may be adhered to.