Electric control devices for battery power systems of motor vehicles, boats, and industrial systems to conduct, distribute, convert, protect, store, regulate, and manage electricity, namely, electric switches for batteries, battery combiners that allow for multiple batteries to be charged, battery isolators, low voltage disconnect switches, electric flasher switches, timers, solid state contactors, lighting dimmers, power management devices in the nature of time delay relays, voltage sensitive relays, automatic charging relays that control the flow and direction of electrical power, galvanic isolators, indicator lights, voltage protection devices in the nature of surge protectors, automatic power selectors in the nature of source selection relays which enable installation of a seamless, redundant power system for critical electronic loads, voltmeters, ammeters, current sensors, electric control panels, fuse blocks, bus bars, battery monitors, terminal blocks, solar panels for production of electricity, electric control panels, distribution boxes for electrical power, electric cables, feed-through fittings for routing wire and cable into and out of junction boxes and across compartment boundaries, junction boxes, electric relays; Circuit breakers; Fuses; Electrical shunts that allow for electric currents to bypass a point in a circuit; Electric current switches; Electric connectors; Solenoid valves; Current converters; Voltage regulator converters; Battery chargers; Inverters for power supply