Electrical connectors for medical lead having weld-less wiring connection

Low resistivity, implantable electrical connectors and biomedical leads having the connectors mechanically coupled in a non-welded attachment to low resistivity wires to extend implanted device battery life. One electrical connector includes an electrically conductive housing having a longitudinal aperture and an inner facing circumferential channel. A spring disposed within the channel can contact an inserted electrode. The housing can include at least one hole adjacent a mechanically deformable side wall for mechanically securing an electrical conductor inserted within the hole. The low resistivity, implantable, biocompatible electrical connectors and leads can be used in neurological and cardiac applications.